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zstd: Fixing mixed module-builtin objects

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With CONFIG_ZSTD_COMPRESS=m and CONFIG_ZSTD_DECOMPRESS=y we end up in
a situation when files from lib/zstd/common/ are compiled once to be
linked later for ZSTD_DECOMPRESS (build-in) and ZSTD_COMPRESS (module)
even though CFLAGS are different for builtins and modules.
So far somehow this was not a problem but enabling LLVM LTO exposes
the problem as:

ld.lld: error: linking module flags 'Code Model': IDs have conflicting values in 'lib/built-in.a(zstd_common.o at 5868)' and 'ld-temp.o'

This particular conflict is caused by KBUILD_CFLAGS=-mcmodel=medium vs.
KBUILD_CFLAGS_MODULE=-mcmodel=large , modules use the large model on
POWERPC as explained at
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/powerpc/Makefile?h=v5.18-rc4#n127
but the current use of common files is wrong anyway.

This works around the issue by introducing a zstd_common module with
shared code.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Alexey Kardashevskiy 2022-09-29 12:08:23 +10:00 committed by Masahiro Yamada
parent d32b55f4bb
commit 637a642f5c
4 changed files with 27 additions and 12 deletions
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8
lib/Kconfig
View File

@ -343,12 +343,16 @@ config LZ4HC_COMPRESS
config LZ4_DECOMPRESS
tristate
config ZSTD_COMPRESS
config ZSTD_COMMON
select XXHASH
tristate
config ZSTD_COMPRESS
select ZSTD_COMMON
tristate
config ZSTD_DECOMPRESS
select XXHASH
select ZSTD_COMMON
tristate
source "lib/xz/Kconfig"

16
lib/zstd/Makefile
View File

@ -10,14 +10,10 @@
# ################################################################
obj-$(CONFIG_ZSTD_COMPRESS) += zstd_compress.o
obj-$(CONFIG_ZSTD_DECOMPRESS) += zstd_decompress.o
obj-$(CONFIG_ZSTD_COMMON) += zstd_common.o
zstd_compress-y := \
zstd_compress_module.o \
common/debug.o \
common/entropy_common.o \
common/error_private.o \
common/fse_decompress.o \
common/zstd_common.o \
compress/fse_compress.o \
compress/hist.o \
compress/huf_compress.o \
@ -33,12 +29,14 @@ zstd_compress-y := \
zstd_decompress-y := \
zstd_decompress_module.o \
decompress/huf_decompress.o \
decompress/zstd_ddict.o \
decompress/zstd_decompress.o \
decompress/zstd_decompress_block.o \
zstd_common-y := \
common/debug.o \
common/entropy_common.o \
common/error_private.o \
common/fse_decompress.o \
common/zstd_common.o \
decompress/huf_decompress.o \
decompress/zstd_ddict.o \
decompress/zstd_decompress.o \
decompress/zstd_decompress_block.o \

5
lib/zstd/common/entropy_common.c
View File

@ -15,6 +15,7 @@
/* *************************************
* Dependencies
***************************************/
#include <linux/module.h>
#include "mem.h"
#include "error_private.h" /* ERR_*, ERROR */
#define FSE_STATIC_LINKING_ONLY /* FSE_MIN_TABLELOG */
@ -239,7 +240,7 @@ size_t FSE_readNCount(
{
return FSE_readNCount_bmi2(normalizedCounter, maxSVPtr, tableLogPtr, headerBuffer, hbSize, /* bmi2 */ 0);
}
EXPORT_SYMBOL_GPL(FSE_readNCount);
/*! HUF_readStats() :
Read compact Huffman tree, saved by HUF_writeCTable().
@ -255,6 +256,7 @@ size_t HUF_readStats(BYTE* huffWeight, size_t hwSize, U32* rankStats,
U32 wksp[HUF_READ_STATS_WORKSPACE_SIZE_U32];
return HUF_readStats_wksp(huffWeight, hwSize, rankStats, nbSymbolsPtr, tableLogPtr, src, srcSize, wksp, sizeof(wksp), /* bmi2 */ 0);
}
EXPORT_SYMBOL_GPL(HUF_readStats);
FORCE_INLINE_TEMPLATE size_t
HUF_readStats_body(BYTE* huffWeight, size_t hwSize, U32* rankStats,
@ -355,3 +357,4 @@ size_t HUF_readStats_wksp(BYTE* huffWeight, size_t hwSize, U32* rankStats,
(void)bmi2;
return HUF_readStats_body_default(huffWeight, hwSize, rankStats, nbSymbolsPtr, tableLogPtr, src, srcSize, workSpace, wkspSize);
}
EXPORT_SYMBOL_GPL(HUF_readStats_wksp);

10
lib/zstd/common/zstd_common.c
View File

@ -13,6 +13,7 @@
/*-*************************************
* Dependencies
***************************************/
#include <linux/module.h>
#define ZSTD_DEPS_NEED_MALLOC
#include "zstd_deps.h" /* ZSTD_malloc, ZSTD_calloc, ZSTD_free, ZSTD_memset */
#include "error_private.h"
@ -35,14 +36,17 @@ const char* ZSTD_versionString(void) { return ZSTD_VERSION_STRING; }
* tells if a return value is an error code
* symbol is required for external callers */
unsigned ZSTD_isError(size_t code) { return ERR_isError(code); }
EXPORT_SYMBOL_GPL(ZSTD_isError);
/*! ZSTD_getErrorName() :
* provides error code string from function result (useful for debugging) */
const char* ZSTD_getErrorName(size_t code) { return ERR_getErrorName(code); }
EXPORT_SYMBOL_GPL(ZSTD_getErrorName);
/*! ZSTD_getError() :
* convert a `size_t` function result into a proper ZSTD_errorCode enum */
ZSTD_ErrorCode ZSTD_getErrorCode(size_t code) { return ERR_getErrorCode(code); }
EXPORT_SYMBOL_GPL(ZSTD_getErrorCode);
/*! ZSTD_getErrorString() :
* provides error code string from enum */
@ -59,6 +63,7 @@ void* ZSTD_customMalloc(size_t size, ZSTD_customMem customMem)
return customMem.customAlloc(customMem.opaque, size);
return ZSTD_malloc(size);
}
EXPORT_SYMBOL_GPL(ZSTD_customMalloc);
void* ZSTD_customCalloc(size_t size, ZSTD_customMem customMem)
{
@ -71,6 +76,7 @@ void* ZSTD_customCalloc(size_t size, ZSTD_customMem customMem)
}
return ZSTD_calloc(1, size);
}
EXPORT_SYMBOL_GPL(ZSTD_customCalloc);
void ZSTD_customFree(void* ptr, ZSTD_customMem customMem)
{
@ -81,3 +87,7 @@ void ZSTD_customFree(void* ptr, ZSTD_customMem customMem)
ZSTD_free(ptr);
}
}
EXPORT_SYMBOL_GPL(ZSTD_customFree);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Zstd Common");