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    Subject[PATCH] [24/34] x86_64: Auto compute __NR_syscall_max at compile time
    Date

    No need to maintain it anymore

    Signed-off-by: Andi Kleen <ak@suse.de>

    ---
    arch/x86_64/kernel/asm-offsets.c | 10 ++++++++++
    arch/x86_64/kernel/syscall.c | 1 +
    include/asm-x86_64/unistd.h | 2 --
    3 files changed, 11 insertions(+), 2 deletions(-)

    Index: linux/arch/x86_64/kernel/asm-offsets.c
    ===================================================================
    --- linux.orig/arch/x86_64/kernel/asm-offsets.c
    +++ linux/arch/x86_64/kernel/asm-offsets.c
    @@ -21,6 +21,14 @@

    #define BLANK() asm volatile("\n->" : : )

    +#define __NO_STUBS 1
    +#undef __SYSCALL
    +#undef _ASM_X86_64_UNISTD_H_
    +#define __SYSCALL(nr, sym) [nr] = 1,
    +static char syscalls[] = {
    +#include <asm/unistd.h>
    +};
    +
    int main(void)
    {
    #define ENTRY(entry) DEFINE(tsk_ ## entry, offsetof(struct task_struct, entry))
    @@ -71,5 +79,7 @@ int main(void)
    DEFINE(TSS_ist, offsetof(struct tss_struct, ist));
    BLANK();
    DEFINE(crypto_tfm_ctx_offset, offsetof(struct crypto_tfm, __crt_ctx));
    + BLANK();
    + DEFINE(__NR_syscall_max, sizeof(syscalls) - 1);
    return 0;
    }
    Index: linux/arch/x86_64/kernel/syscall.c
    ===================================================================
    --- linux.orig/arch/x86_64/kernel/syscall.c
    +++ linux/arch/x86_64/kernel/syscall.c
    @@ -3,6 +3,7 @@
    #include <linux/linkage.h>
    #include <linux/sys.h>
    #include <linux/cache.h>
    +#include <asm/asm-offsets.h>

    #define __NO_STUBS

    Index: linux/include/asm-x86_64/unistd.h
    ===================================================================
    --- linux.orig/include/asm-x86_64/unistd.h
    +++ linux/include/asm-x86_64/unistd.h
    @@ -620,8 +620,6 @@ __SYSCALL(__NR_vmsplice, sys_vmsplice)
    #define __NR_move_pages 279
    __SYSCALL(__NR_move_pages, sys_move_pages)

    -#define __NR_syscall_max __NR_move_pages
    -
    #ifndef __NO_STUBS
    #define __ARCH_WANT_OLD_READDIR
    #define __ARCH_WANT_OLD_STAT
    -
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