diff options
Diffstat (limited to 'sys-kernel/linux-sources-redcore/files/5.6-support-kernel-and-ramfs-comp-and-decomp-with-zstd.patch')
| -rw-r--r-- | sys-kernel/linux-sources-redcore/files/5.6-support-kernel-and-ramfs-comp-and-decomp-with-zstd.patch | 813 |
1 files changed, 813 insertions, 0 deletions
diff --git a/sys-kernel/linux-sources-redcore/files/5.6-support-kernel-and-ramfs-comp-and-decomp-with-zstd.patch b/sys-kernel/linux-sources-redcore/files/5.6-support-kernel-and-ramfs-comp-and-decomp-with-zstd.patch new file mode 100644 index 00000000..28141f16 --- /dev/null +++ b/sys-kernel/linux-sources-redcore/files/5.6-support-kernel-and-ramfs-comp-and-decomp-with-zstd.patch @@ -0,0 +1,813 @@ +diff -Naur linux-5.6.1/arch/x86/boot/compressed/Makefile linux-5.6.1-p/arch/x86/boot/compressed/Makefile +--- linux-5.6.1/arch/x86/boot/compressed/Makefile 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/arch/x86/boot/compressed/Makefile 2020-04-01 13:29:07.958649103 +0200 +@@ -24,7 +24,7 @@ + KCOV_INSTRUMENT := n + + targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \ +- vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 ++ vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 vmlinux.bin.zst + + KBUILD_CFLAGS := -m$(BITS) -O2 + KBUILD_CFLAGS += -fno-strict-aliasing $(call cc-option, -fPIE, -fPIC) +@@ -145,6 +145,8 @@ + $(call if_changed,lzo) + $(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE + $(call if_changed,lz4) ++$(obj)/vmlinux.bin.zst: $(vmlinux.bin.all-y) FORCE ++ $(call if_changed,zstd) + + suffix-$(CONFIG_KERNEL_GZIP) := gz + suffix-$(CONFIG_KERNEL_BZIP2) := bz2 +@@ -152,6 +154,7 @@ + suffix-$(CONFIG_KERNEL_XZ) := xz + suffix-$(CONFIG_KERNEL_LZO) := lzo + suffix-$(CONFIG_KERNEL_LZ4) := lz4 ++suffix-$(CONFIG_KERNEL_ZSTD) := zst + + quiet_cmd_mkpiggy = MKPIGGY $@ + cmd_mkpiggy = $(obj)/mkpiggy $< > $@ +diff -Naur linux-5.6.1/arch/x86/boot/compressed/misc.c linux-5.6.1-p/arch/x86/boot/compressed/misc.c +--- linux-5.6.1/arch/x86/boot/compressed/misc.c 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/arch/x86/boot/compressed/misc.c 2020-04-01 13:29:07.958649103 +0200 +@@ -77,6 +77,10 @@ + #ifdef CONFIG_KERNEL_LZ4 + #include "../../../../lib/decompress_unlz4.c" + #endif ++ ++#ifdef CONFIG_KERNEL_ZSTD ++#include "../../../../lib/decompress_unzstd.c" ++#endif + /* + * NOTE: When adding a new decompressor, please update the analysis in + * ../header.S. +diff -Naur linux-5.6.1/arch/x86/boot/header.S linux-5.6.1-p/arch/x86/boot/header.S +--- linux-5.6.1/arch/x86/boot/header.S 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/arch/x86/boot/header.S 2020-04-01 13:29:03.958623285 +0200 +@@ -536,8 +536,14 @@ + # the size-dependent part now grows so fast. + # + # extra_bytes = (uncompressed_size >> 8) + 65536 ++# ++# ZSTD compressed data grows by at most 3 bytes per 128K, and only has a 22 ++# byte fixed overhead but has a maximum block size of 128K, so it needs a ++# larger margin. ++# ++# extra_bytes = (uncompressed_size >> 8) + 131072 + +-#define ZO_z_extra_bytes ((ZO_z_output_len >> 8) + 65536) ++#define ZO_z_extra_bytes ((ZO_z_output_len >> 8) + 131072) + #if ZO_z_output_len > ZO_z_input_len + # define ZO_z_extract_offset (ZO_z_output_len + ZO_z_extra_bytes - \ + ZO_z_input_len) +diff -Naur linux-5.6.1/arch/x86/include/asm/boot.h linux-5.6.1-p/arch/x86/include/asm/boot.h +--- linux-5.6.1/arch/x86/include/asm/boot.h 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/arch/x86/include/asm/boot.h 2020-04-01 13:29:07.958649103 +0200 +@@ -24,9 +24,11 @@ + # error "Invalid value for CONFIG_PHYSICAL_ALIGN" + #endif + +-#ifdef CONFIG_KERNEL_BZIP2 ++#if defined(CONFIG_KERNEL_BZIP2) + # define BOOT_HEAP_SIZE 0x400000 +-#else /* !CONFIG_KERNEL_BZIP2 */ ++#elif defined(CONFIG_KERNEL_ZSTD) ++# define BOOT_HEAP_SIZE 0x30000 ++#else + # define BOOT_HEAP_SIZE 0x10000 + #endif + +diff -Naur linux-5.6.1/arch/x86/Kconfig linux-5.6.1-p/arch/x86/Kconfig +--- linux-5.6.1/arch/x86/Kconfig 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/arch/x86/Kconfig 2020-04-01 13:29:07.958649103 +0200 +@@ -183,6 +183,7 @@ + select HAVE_KERNEL_LZMA + select HAVE_KERNEL_LZO + select HAVE_KERNEL_XZ ++ select HAVE_KERNEL_ZSTD + select HAVE_KPROBES + select HAVE_KPROBES_ON_FTRACE + select HAVE_FUNCTION_ERROR_INJECTION +diff -Naur linux-5.6.1/Documentation/x86/boot.rst linux-5.6.1-p/Documentation/x86/boot.rst +--- linux-5.6.1/Documentation/x86/boot.rst 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/Documentation/x86/boot.rst 2020-04-01 13:29:07.958649103 +0200 +@@ -786,9 +786,9 @@ + uncompressed data should be determined using the standard magic + numbers. The currently supported compression formats are gzip + (magic numbers 1F 8B or 1F 9E), bzip2 (magic number 42 5A), LZMA +- (magic number 5D 00), XZ (magic number FD 37), and LZ4 (magic number +- 02 21). The uncompressed payload is currently always ELF (magic +- number 7F 45 4C 46). ++ (magic number 5D 00), XZ (magic number FD 37), LZ4 (magic number ++ 02 21) and ZSTD (magic number 28 B5). The uncompressed payload is ++ currently always ELF (magic number 7F 45 4C 46). + + ============ ============== + Field name: payload_length +diff -Naur linux-5.6.1/.gitignore linux-5.6.1-p/.gitignore +--- linux-5.6.1/.gitignore 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/.gitignore 2020-04-01 13:29:11.158669756 +0200 +@@ -43,6 +43,7 @@ + *.tab.[ch] + *.tar + *.xz ++*.zst + Module.symvers + modules.builtin + modules.order +diff -Naur linux-5.6.1/include/linux/decompress/unzstd.h linux-5.6.1-p/include/linux/decompress/unzstd.h +--- linux-5.6.1/include/linux/decompress/unzstd.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-5.6.1-p/include/linux/decompress/unzstd.h 2020-04-01 13:28:53.998558979 +0200 +@@ -0,0 +1,11 @@ ++/* SPDX-License-Identifier: GPL-2.0 */ ++#ifndef LINUX_DECOMPRESS_UNZSTD_H ++#define LINUX_DECOMPRESS_UNZSTD_H ++ ++int unzstd(unsigned char *inbuf, long len, ++ long (*fill)(void*, unsigned long), ++ long (*flush)(void*, unsigned long), ++ unsigned char *output, ++ long *pos, ++ void (*error_fn)(char *x)); ++#endif +diff -Naur linux-5.6.1/init/Kconfig linux-5.6.1-p/init/Kconfig +--- linux-5.6.1/init/Kconfig 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/init/Kconfig 2020-04-01 13:28:58.038585064 +0200 +@@ -173,13 +173,16 @@ + config HAVE_KERNEL_LZ4 + bool + ++config HAVE_KERNEL_ZSTD ++ bool ++ + config HAVE_KERNEL_UNCOMPRESSED + bool + + choice + prompt "Kernel compression mode" + default KERNEL_GZIP +- depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO || HAVE_KERNEL_LZ4 || HAVE_KERNEL_UNCOMPRESSED ++ depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO || HAVE_KERNEL_LZ4 || HAVE_KERNEL_ZSTD || HAVE_KERNEL_UNCOMPRESSED + help + The linux kernel is a kind of self-extracting executable. + Several compression algorithms are available, which differ +@@ -258,6 +261,16 @@ + is about 8% bigger than LZO. But the decompression speed is + faster than LZO. + ++config KERNEL_ZSTD ++ bool "ZSTD" ++ depends on HAVE_KERNEL_ZSTD ++ help ++ ZSTD is a compression algorithm targeting intermediate compression ++ with fast decompression speed. It will compress better than GZIP and ++ decompress around the same speed as LZO, but slower than LZ4. You ++ will need at least 192 KB RAM or more for booting. The zstd command ++ line tools is required for compression. ++ + config KERNEL_UNCOMPRESSED + bool "None" + depends on HAVE_KERNEL_UNCOMPRESSED +diff -Naur linux-5.6.1/lib/decompress.c linux-5.6.1-p/lib/decompress.c +--- linux-5.6.1/lib/decompress.c 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/lib/decompress.c 2020-04-01 13:28:53.998558979 +0200 +@@ -13,6 +13,7 @@ + #include <linux/decompress/inflate.h> + #include <linux/decompress/unlzo.h> + #include <linux/decompress/unlz4.h> ++#include <linux/decompress/unzstd.h> + + #include <linux/types.h> + #include <linux/string.h> +@@ -37,6 +38,9 @@ + #ifndef CONFIG_DECOMPRESS_LZ4 + # define unlz4 NULL + #endif ++#ifndef CONFIG_DECOMPRESS_ZSTD ++# define unzstd NULL ++#endif + + struct compress_format { + unsigned char magic[2]; +@@ -52,6 +56,7 @@ + { {0xfd, 0x37}, "xz", unxz }, + { {0x89, 0x4c}, "lzo", unlzo }, + { {0x02, 0x21}, "lz4", unlz4 }, ++ { {0x28, 0xb5}, "zstd", unzstd }, + { {0, 0}, NULL, NULL } + }; + +diff -Naur linux-5.6.1/lib/decompress_unzstd.c linux-5.6.1-p/lib/decompress_unzstd.c +--- linux-5.6.1/lib/decompress_unzstd.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-5.6.1-p/lib/decompress_unzstd.c 2020-04-01 13:28:53.998558979 +0200 +@@ -0,0 +1,342 @@ ++// SPDX-License-Identifier: GPL-2.0 ++ ++/* ++ * Important notes about in-place decompression ++ * ++ * At least on x86, the kernel is decompressed in place: the compressed data ++ * is placed to the end of the output buffer, and the decompressor overwrites ++ * most of the compressed data. There must be enough safety margin to ++ * guarantee that the write position is always behind the read position. ++ * ++ * The safety margin for ZSTD with a 128 KB block size is calculated below. ++ * Note that the margin with ZSTD is bigger than with GZIP or XZ! ++ * ++ * The worst case for in-place decompression is that the beginning of ++ * the file is compressed extremely well, and the rest of the file is ++ * uncompressible. Thus, we must look for worst-case expansion when the ++ * compressor is encoding uncompressible data. ++ * ++ * The structure of the .zst file in case of a compresed kernel is as follows. ++ * Maximum sizes (as bytes) of the fields are in parenthesis. ++ * ++ * Frame Header: (18) ++ * Blocks: (N) ++ * Checksum: (4) ++ * ++ * The frame header and checksum overhead is at most 22 bytes. ++ * ++ * ZSTD stores the data in blocks. Each block has a header whose size is ++ * a 3 bytes. After the block header, there is up to 128 KB of payload. ++ * The maximum uncompressed size of the payload is 128 KB. The minimum ++ * uncompressed size of the payload is never less than the payload size ++ * (excluding the block header). ++ * ++ * The assumption, that the uncompressed size of the payload is never ++ * smaller than the payload itself, is valid only when talking about ++ * the payload as a whole. It is possible that the payload has parts where ++ * the decompressor consumes more input than it produces output. Calculating ++ * the worst case for this would be tricky. Instead of trying to do that, ++ * let's simply make sure that the decompressor never overwrites any bytes ++ * of the payload which it is currently reading. ++ * ++ * Now we have enough information to calculate the safety margin. We need ++ * - 22 bytes for the .zst file format headers; ++ * - 3 bytes per every 128 KiB of uncompressed size (one block header per ++ * block); and ++ * - 128 KiB (biggest possible zstd block size) to make sure that the ++ * decompressor never overwrites anything from the block it is currently ++ * reading. ++ * ++ * We get the following formula: ++ * ++ * safety_margin = 22 + uncompressed_size * 3 / 131072 + 131072 ++ * <= 22 + (uncompressed_size >> 15) + 131072 ++ */ ++ ++/* ++ * Preboot environments #include "path/to/decompress_unzstd.c". ++ * All of the source files we depend on must be #included. ++ * zstd's only source dependeny is xxhash, which has no source ++ * dependencies. ++ * ++ * zstd and xxhash avoid declaring themselves as modules ++ * when ZSTD_PREBOOT and XXH_PREBOOT are defined. ++ */ ++#ifdef STATIC ++# define ZSTD_PREBOOT ++# define XXH_PREBOOT ++# include "xxhash.c" ++# include "zstd/entropy_common.c" ++# include "zstd/fse_decompress.c" ++# include "zstd/huf_decompress.c" ++# include "zstd/zstd_common.c" ++# include "zstd/decompress.c" ++#endif ++ ++#include <linux/decompress/mm.h> ++#include <linux/kernel.h> ++#include <linux/zstd.h> ++ ++/* 128MB is the maximum window size supported by zstd. */ ++#define ZSTD_WINDOWSIZE_MAX (1 << ZSTD_WINDOWLOG_MAX) ++/* Size of the input and output buffers in multi-call mode. ++ * Pick a larger size because it isn't used during kernel decompression, ++ * since that is single pass, and we have to allocate a large buffer for ++ * zstd's window anyways. The larger size speeds up initramfs decompression. ++ */ ++#define ZSTD_IOBUF_SIZE (1 << 17) ++ ++static int INIT handle_zstd_error(size_t ret, void (*error)(char *x)) ++{ ++ const int err = ZSTD_getErrorCode(ret); ++ ++ if (!ZSTD_isError(ret)) ++ return 0; ++ ++ switch (err) { ++ case ZSTD_error_memory_allocation: ++ error("ZSTD decompressor ran out of memory"); ++ break; ++ case ZSTD_error_prefix_unknown: ++ error("Input is not in the ZSTD format (wrong magic bytes)"); ++ break; ++ case ZSTD_error_dstSize_tooSmall: ++ case ZSTD_error_corruption_detected: ++ case ZSTD_error_checksum_wrong: ++ error("ZSTD-compressed data is corrupt"); ++ break; ++ default: ++ error("ZSTD-compressed data is probably corrupt"); ++ break; ++ } ++ return -1; ++} ++ ++/* ++ * Handle the case where we have the entire input and output in one segment. ++ * We can allocate less memory (no circular buffer for the sliding window), ++ * and avoid some memcpy() calls. ++ */ ++static int INIT decompress_single(const u8 *in_buf, long in_len, u8 *out_buf, ++ long out_len, long *in_pos, ++ void (*error)(char *x)) ++{ ++ const size_t wksp_size = ZSTD_DCtxWorkspaceBound(); ++ void *wksp = large_malloc(wksp_size); ++ ZSTD_DCtx *dctx = ZSTD_initDCtx(wksp, wksp_size); ++ int err; ++ size_t ret; ++ ++ if (dctx == NULL) { ++ error("Out of memory while allocating ZSTD_DCtx"); ++ err = -1; ++ goto out; ++ } ++ /* ++ * Find out how large the frame actually is, there may be junk at ++ * the end of the frame that ZSTD_decompressDCtx() can't handle. ++ */ ++ ret = ZSTD_findFrameCompressedSize(in_buf, in_len); ++ err = handle_zstd_error(ret, error); ++ if (err) ++ goto out; ++ in_len = (long)ret; ++ ++ ret = ZSTD_decompressDCtx(dctx, out_buf, out_len, in_buf, in_len); ++ err = handle_zstd_error(ret, error); ++ if (err) ++ goto out; ++ ++ if (in_pos != NULL) ++ *in_pos = in_len; ++ ++ err = 0; ++out: ++ if (wksp != NULL) ++ large_free(wksp); ++ return err; ++} ++ ++static int INIT __unzstd(unsigned char *in_buf, long in_len, ++ long (*fill)(void*, unsigned long), ++ long (*flush)(void*, unsigned long), ++ unsigned char *out_buf, long out_len, ++ long *in_pos, ++ void (*error)(char *x)) ++{ ++ ZSTD_inBuffer in; ++ ZSTD_outBuffer out; ++ ZSTD_frameParams params; ++ void *in_allocated = NULL; ++ void *out_allocated = NULL; ++ void *wksp = NULL; ++ size_t wksp_size; ++ ZSTD_DStream *dstream; ++ int err; ++ size_t ret; ++ ++ if (out_len == 0) ++ out_len = LONG_MAX; /* no limit */ ++ ++ if (fill == NULL && flush == NULL) ++ /* ++ * We can decompress faster and with less memory when we have a ++ * single chunk. ++ */ ++ return decompress_single(in_buf, in_len, out_buf, out_len, ++ in_pos, error); ++ ++ /* ++ * If in_buf is not provided, we must be using fill(), so allocate ++ * a large enough buffer. If it is provided, it must be at least ++ * ZSTD_IOBUF_SIZE large. ++ */ ++ if (in_buf == NULL) { ++ in_allocated = large_malloc(ZSTD_IOBUF_SIZE); ++ if (in_allocated == NULL) { ++ error("Out of memory while allocating input buffer"); ++ err = -1; ++ goto out; ++ } ++ in_buf = in_allocated; ++ in_len = 0; ++ } ++ /* Read the first chunk, since we need to decode the frame header. */ ++ if (fill != NULL) ++ in_len = fill(in_buf, ZSTD_IOBUF_SIZE); ++ if (in_len < 0) { ++ error("ZSTD-compressed data is truncated"); ++ err = -1; ++ goto out; ++ } ++ /* Set the first non-empty input buffer. */ ++ in.src = in_buf; ++ in.pos = 0; ++ in.size = in_len; ++ /* Allocate the output buffer if we are using flush(). */ ++ if (flush != NULL) { ++ out_allocated = large_malloc(ZSTD_IOBUF_SIZE); ++ if (out_allocated == NULL) { ++ error("Out of memory while allocating output buffer"); ++ err = -1; ++ goto out; ++ } ++ out_buf = out_allocated; ++ out_len = ZSTD_IOBUF_SIZE; ++ } ++ /* Set the output buffer. */ ++ out.dst = out_buf; ++ out.pos = 0; ++ out.size = out_len; ++ ++ /* ++ * We need to know the window size to allocate the ZSTD_DStream. ++ * Since we are streaming, we need to allocate a buffer for the sliding ++ * window. The window size varies from 1 KB to ZSTD_WINDOWSIZE_MAX ++ * (8 MB), so it is important to use the actual value so as not to ++ * waste memory when it is smaller. ++ */ ++ ret = ZSTD_getFrameParams(¶ms, in.src, in.size); ++ err = handle_zstd_error(ret, error); ++ if (err) ++ goto out; ++ if (ret != 0) { ++ error("ZSTD-compressed data has an incomplete frame header"); ++ err = -1; ++ goto out; ++ } ++ if (params.windowSize > ZSTD_WINDOWSIZE_MAX) { ++ error("ZSTD-compressed data has too large a window size"); ++ err = -1; ++ goto out; ++ } ++ ++ /* ++ * Allocate the ZSTD_DStream now that we know how much memory is ++ * required. ++ */ ++ wksp_size = ZSTD_DStreamWorkspaceBound(params.windowSize); ++ wksp = large_malloc(wksp_size); ++ dstream = ZSTD_initDStream(params.windowSize, wksp, wksp_size); ++ if (dstream == NULL) { ++ error("Out of memory while allocating ZSTD_DStream"); ++ err = -1; ++ goto out; ++ } ++ ++ /* ++ * Decompression loop: ++ * Read more data if necessary (error if no more data can be read). ++ * Call the decompression function, which returns 0 when finished. ++ * Flush any data produced if using flush(). ++ */ ++ if (in_pos != NULL) ++ *in_pos = 0; ++ do { ++ /* ++ * If we need to reload data, either we have fill() and can ++ * try to get more data, or we don't and the input is truncated. ++ */ ++ if (in.pos == in.size) { ++ if (in_pos != NULL) ++ *in_pos += in.pos; ++ in_len = fill ? fill(in_buf, ZSTD_IOBUF_SIZE) : -1; ++ if (in_len < 0) { ++ error("ZSTD-compressed data is truncated"); ++ err = -1; ++ goto out; ++ } ++ in.pos = 0; ++ in.size = in_len; ++ } ++ /* Returns zero when the frame is complete. */ ++ ret = ZSTD_decompressStream(dstream, &out, &in); ++ err = handle_zstd_error(ret, error); ++ if (err) ++ goto out; ++ /* Flush all of the data produced if using flush(). */ ++ if (flush != NULL && out.pos > 0) { ++ if (out.pos != flush(out.dst, out.pos)) { ++ error("Failed to flush()"); ++ err = -1; ++ goto out; ++ } ++ out.pos = 0; ++ } ++ } while (ret != 0); ++ ++ if (in_pos != NULL) ++ *in_pos += in.pos; ++ ++ err = 0; ++out: ++ if (in_allocated != NULL) ++ large_free(in_allocated); ++ if (out_allocated != NULL) ++ large_free(out_allocated); ++ if (wksp != NULL) ++ large_free(wksp); ++ return err; ++} ++ ++#ifndef ZSTD_PREBOOT ++STATIC int INIT unzstd(unsigned char *buf, long len, ++ long (*fill)(void*, unsigned long), ++ long (*flush)(void*, unsigned long), ++ unsigned char *out_buf, ++ long *pos, ++ void (*error)(char *x)) ++{ ++ return __unzstd(buf, len, fill, flush, out_buf, 0, pos, error); ++} ++#else ++STATIC int INIT __decompress(unsigned char *buf, long len, ++ long (*fill)(void*, unsigned long), ++ long (*flush)(void*, unsigned long), ++ unsigned char *out_buf, long out_len, ++ long *pos, ++ void (*error)(char *x)) ++{ ++ return __unzstd(buf, len, fill, flush, out_buf, out_len, pos, error); ++} ++#endif +diff -Naur linux-5.6.1/lib/Kconfig linux-5.6.1-p/lib/Kconfig +--- linux-5.6.1/lib/Kconfig 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/lib/Kconfig 2020-04-01 13:28:53.998558979 +0200 +@@ -336,6 +336,10 @@ + select LZ4_DECOMPRESS + tristate + ++config DECOMPRESS_ZSTD ++ select ZSTD_DECOMPRESS ++ tristate ++ + # + # Generic allocator support is selected if needed + # +diff -Naur linux-5.6.1/lib/Makefile linux-5.6.1-p/lib/Makefile +--- linux-5.6.1/lib/Makefile 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/lib/Makefile 2020-04-01 13:28:53.998558979 +0200 +@@ -160,6 +160,7 @@ + lib-$(CONFIG_DECOMPRESS_XZ) += decompress_unxz.o + lib-$(CONFIG_DECOMPRESS_LZO) += decompress_unlzo.o + lib-$(CONFIG_DECOMPRESS_LZ4) += decompress_unlz4.o ++lib-$(CONFIG_DECOMPRESS_ZSTD) += decompress_unzstd.o + + obj-$(CONFIG_TEXTSEARCH) += textsearch.o + obj-$(CONFIG_TEXTSEARCH_KMP) += ts_kmp.o +diff -Naur linux-5.6.1/lib/xxhash.c linux-5.6.1-p/lib/xxhash.c +--- linux-5.6.1/lib/xxhash.c 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/lib/xxhash.c 2020-04-01 13:28:51.078540121 +0200 +@@ -80,13 +80,11 @@ + { + memcpy(dst, src, sizeof(*dst)); + } +-EXPORT_SYMBOL(xxh32_copy_state); + + void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src) + { + memcpy(dst, src, sizeof(*dst)); + } +-EXPORT_SYMBOL(xxh64_copy_state); + + /*-*************************** + * Simple Hash Functions +@@ -151,7 +149,6 @@ + + return h32; + } +-EXPORT_SYMBOL(xxh32); + + static uint64_t xxh64_round(uint64_t acc, const uint64_t input) + { +@@ -234,7 +231,6 @@ + + return h64; + } +-EXPORT_SYMBOL(xxh64); + + /*-************************************************** + * Advanced Hash Functions +@@ -251,7 +247,6 @@ + state.v4 = seed - PRIME32_1; + memcpy(statePtr, &state, sizeof(state)); + } +-EXPORT_SYMBOL(xxh32_reset); + + void xxh64_reset(struct xxh64_state *statePtr, const uint64_t seed) + { +@@ -265,7 +260,6 @@ + state.v4 = seed - PRIME64_1; + memcpy(statePtr, &state, sizeof(state)); + } +-EXPORT_SYMBOL(xxh64_reset); + + int xxh32_update(struct xxh32_state *state, const void *input, const size_t len) + { +@@ -334,7 +328,6 @@ + + return 0; + } +-EXPORT_SYMBOL(xxh32_update); + + uint32_t xxh32_digest(const struct xxh32_state *state) + { +@@ -372,7 +365,6 @@ + + return h32; + } +-EXPORT_SYMBOL(xxh32_digest); + + int xxh64_update(struct xxh64_state *state, const void *input, const size_t len) + { +@@ -439,7 +431,6 @@ + + return 0; + } +-EXPORT_SYMBOL(xxh64_update); + + uint64_t xxh64_digest(const struct xxh64_state *state) + { +@@ -494,7 +485,19 @@ + + return h64; + } ++ ++#ifndef XXH_PREBOOT ++EXPORT_SYMBOL(xxh32_copy_state); ++EXPORT_SYMBOL(xxh64_copy_state); ++EXPORT_SYMBOL(xxh32); ++EXPORT_SYMBOL(xxh64); ++EXPORT_SYMBOL(xxh32_reset); ++EXPORT_SYMBOL(xxh64_reset); ++EXPORT_SYMBOL(xxh32_update); ++EXPORT_SYMBOL(xxh32_digest); ++EXPORT_SYMBOL(xxh64_update); + EXPORT_SYMBOL(xxh64_digest); + + MODULE_LICENSE("Dual BSD/GPL"); + MODULE_DESCRIPTION("xxHash"); ++#endif +diff -Naur linux-5.6.1/lib/zstd/decompress.c linux-5.6.1-p/lib/zstd/decompress.c +--- linux-5.6.1/lib/zstd/decompress.c 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/lib/zstd/decompress.c 2020-04-01 13:28:46.908513191 +0200 +@@ -2490,6 +2490,7 @@ + } + } + ++#ifndef ZSTD_PREBOOT + EXPORT_SYMBOL(ZSTD_DCtxWorkspaceBound); + EXPORT_SYMBOL(ZSTD_initDCtx); + EXPORT_SYMBOL(ZSTD_decompressDCtx); +@@ -2529,3 +2530,4 @@ + + MODULE_LICENSE("Dual BSD/GPL"); + MODULE_DESCRIPTION("Zstd Decompressor"); ++#endif +diff -Naur linux-5.6.1/lib/zstd/fse_decompress.c linux-5.6.1-p/lib/zstd/fse_decompress.c +--- linux-5.6.1/lib/zstd/fse_decompress.c 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/lib/zstd/fse_decompress.c 2020-04-01 13:28:46.908513191 +0200 +@@ -47,6 +47,7 @@ + ****************************************************************/ + #include "bitstream.h" + #include "fse.h" ++#include "zstd_internal.h" + #include <linux/compiler.h> + #include <linux/kernel.h> + #include <linux/string.h> /* memcpy, memset */ +@@ -60,14 +61,6 @@ + enum { FSE_static_assert = 1 / (int)(!!(c)) }; \ + } /* use only *after* variable declarations */ + +-/* check and forward error code */ +-#define CHECK_F(f) \ +- { \ +- size_t const e = f; \ +- if (FSE_isError(e)) \ +- return e; \ +- } +- + /* ************************************************************** + * Templates + ****************************************************************/ +diff -Naur linux-5.6.1/lib/zstd/zstd_internal.h linux-5.6.1-p/lib/zstd/zstd_internal.h +--- linux-5.6.1/lib/zstd/zstd_internal.h 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/lib/zstd/zstd_internal.h 2020-04-01 13:28:46.908513191 +0200 +@@ -127,7 +127,14 @@ + * Shared functions to include for inlining + *********************************************/ + ZSTD_STATIC void ZSTD_copy8(void *dst, const void *src) { +- memcpy(dst, src, 8); ++ /* ++ * zstd relies heavily on gcc being able to analyze and inline this ++ * memcpy() call, since it is called in a tight loop. Preboot mode ++ * is compiled in freestanding mode, which stops gcc from analyzing ++ * memcpy(). Use __builtin_memcpy() to tell gcc to analyze this as a ++ * regular memcpy(). ++ */ ++ __builtin_memcpy(dst, src, 8); + } + /*! ZSTD_wildcopy() : + * custom version of memcpy(), can copy up to 7 bytes too many (8 bytes if length==0) */ +@@ -137,13 +144,16 @@ + const BYTE* ip = (const BYTE*)src; + BYTE* op = (BYTE*)dst; + BYTE* const oend = op + length; +- /* Work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81388. ++#if defined(GCC_VERSION) && GCC_VERSION >= 70000 && GCC_VERSION < 70200 ++ /* ++ * Work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81388. + * Avoid the bad case where the loop only runs once by handling the + * special case separately. This doesn't trigger the bug because it + * doesn't involve pointer/integer overflow. + */ + if (length <= 8) + return ZSTD_copy8(dst, src); ++#endif + do { + ZSTD_copy8(op, ip); + op += 8; +diff -Naur linux-5.6.1/scripts/Makefile.lib linux-5.6.1-p/scripts/Makefile.lib +--- linux-5.6.1/scripts/Makefile.lib 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/scripts/Makefile.lib 2020-04-01 13:28:58.038585064 +0200 +@@ -394,6 +394,21 @@ + quiet_cmd_xzmisc = XZMISC $@ + cmd_xzmisc = cat $(real-prereqs) | xz --check=crc32 --lzma2=dict=1MiB > $@ + ++# ZSTD ++# --------------------------------------------------------------------------- ++# Appends the uncompressed size of the data using size_append. The .zst ++# format has the size information available at the beginning of the file too, ++# but it's in a more complex format and it's good to avoid changing the part ++# of the boot code that reads the uncompressed size. ++# Note that the bytes added by size_append will make the zstd tool think that ++# the file is corrupt. This is expected. ++ ++quiet_cmd_zstd = ZSTD $@ ++cmd_zstd = (cat $(filter-out FORCE,$^) | \ ++ zstd -19 && \ ++ $(call size_append, $(filter-out FORCE,$^))) > $@ || \ ++ (rm -f $@ ; false) ++ + # ASM offsets + # --------------------------------------------------------------------------- + +diff -Naur linux-5.6.1/usr/Kconfig linux-5.6.1-p/usr/Kconfig +--- linux-5.6.1/usr/Kconfig 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/usr/Kconfig 2020-04-01 13:29:00.978604046 +0200 +@@ -100,6 +100,15 @@ + Support loading of a LZ4 encoded initial ramdisk or cpio buffer + If unsure, say N. + ++config RD_ZSTD ++ bool "Support initial ramdisk/ramfs compressed using ZSTD" ++ default y ++ depends on BLK_DEV_INITRD ++ select DECOMPRESS_ZSTD ++ help ++ Support loading of a ZSTD encoded initial ramdisk or cpio buffer. ++ If unsure, say N. ++ + choice + prompt "Built-in initramfs compression mode" + depends on INITRAMFS_SOURCE != "" +@@ -207,4 +216,15 @@ + short time at boot, while both the cpio image and the unpacked + filesystem image will be present in memory simultaneously + ++config INITRAMFS_COMPRESSION_ZSTD ++ bool "ZSTD" ++ depends on RD_ZSTD ++ help ++ ZSTD is a compression algorithm targeting intermediate compression ++ with fast decompression speed. It will compress better than GZIP and ++ decompress around the same speed as LZO, but slower than LZ4. ++ ++ If you choose this, keep in mind that you may need to install the zstd ++ tool to be able to compress the initram. ++ + endchoice +diff -Naur linux-5.6.1/usr/Makefile linux-5.6.1-p/usr/Makefile +--- linux-5.6.1/usr/Makefile 2020-04-01 10:58:19.000000000 +0200 ++++ linux-5.6.1-p/usr/Makefile 2020-04-01 13:29:00.978604046 +0200 +@@ -15,6 +15,7 @@ + compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc + compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo + compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4 ++compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd + + obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o + |