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f993d24a94
Since commit 80b6093b55 ("kbuild: add -Wundef to KBUILD_CPPFLAGS
for W=1 builds"), building with W=1 detects misuse of #(el)if.
$ make W=1 ARCH=s390 CROSS_COMPILE=s390x-linux-gnu-
[snip]
arch/s390/boot/decompressor.c:28:7: warning: "CONFIG_KERNEL_ZSTD" is not defined, evaluates to 0 [-Wundef]
28 | #elif CONFIG_KERNEL_ZSTD
| ^~~~~~~~~~~~~~~~~~
This issue has been hidden because arch/s390/boot/Makefile overwrites
KBUILD_CFLAGS, dropping -Wundef.
CONFIG_KERNEL_ZSTD is a bool option. #elif defined() should be used.
The line #ifdef CONFIG_KERNEL_BZIP2 is fine, but I changed it for
consistency.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/r/20230106161024.2373602-1-masahiroy@kernel.org
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Definitions and wrapper functions for kernel decompressor
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*
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* Copyright IBM Corp. 2010
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*
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <asm/page.h>
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#include "decompressor.h"
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/*
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* gzip declarations
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*/
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#define STATIC static
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#undef memset
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#undef memcpy
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#undef memmove
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#define memmove memmove
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#define memzero(s, n) memset((s), 0, (n))
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#if defined(CONFIG_KERNEL_BZIP2)
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#define BOOT_HEAP_SIZE 0x400000
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#elif defined(CONFIG_KERNEL_ZSTD)
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#define BOOT_HEAP_SIZE 0x30000
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#else
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#define BOOT_HEAP_SIZE 0x10000
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#endif
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static unsigned long free_mem_ptr = (unsigned long) _end;
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static unsigned long free_mem_end_ptr = (unsigned long) _end + BOOT_HEAP_SIZE;
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#ifdef CONFIG_KERNEL_GZIP
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#include "../../../../lib/decompress_inflate.c"
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#endif
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#ifdef CONFIG_KERNEL_BZIP2
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#include "../../../../lib/decompress_bunzip2.c"
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#endif
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#ifdef CONFIG_KERNEL_LZ4
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#include "../../../../lib/decompress_unlz4.c"
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#endif
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#ifdef CONFIG_KERNEL_LZMA
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#include "../../../../lib/decompress_unlzma.c"
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#endif
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#ifdef CONFIG_KERNEL_LZO
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#include "../../../../lib/decompress_unlzo.c"
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#endif
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#ifdef CONFIG_KERNEL_XZ
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#include "../../../../lib/decompress_unxz.c"
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#endif
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#ifdef CONFIG_KERNEL_ZSTD
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#include "../../../../lib/decompress_unzstd.c"
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#endif
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#define decompress_offset ALIGN((unsigned long)_end + BOOT_HEAP_SIZE, PAGE_SIZE)
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unsigned long mem_safe_offset(void)
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{
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/*
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* due to 4MB HEAD_SIZE for bzip2
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* 'decompress_offset + vmlinux.image_size' could be larger than
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* kernel at final position + its .bss, so take the larger of two
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*/
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return max(decompress_offset + vmlinux.image_size,
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vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size);
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}
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void *decompress_kernel(void)
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{
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void *output = (void *)decompress_offset;
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__decompress(_compressed_start, _compressed_end - _compressed_start,
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NULL, NULL, output, 0, NULL, error);
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return output;
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}
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