diff options
| author | Tong Tiangen <tongtiangen@huawei.com> | 2021-09-01 02:46:20 +0000 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2021-10-02 13:42:25 -0700 |
| commit | 78a743cd82a35ca0724179fc22834f06a2151fc2 (patch) | |
| tree | e15da52d9d6653bdf5e5b399f6eab678716539ae /arch/riscv/include/asm/vdso.h | |
| parent | bb4a23c994aebcd96c567a0be8e964d516bd4a61 (diff) | |
riscv/vdso: Move vdso data page up front
As commit 601255ae3c98 ("arm64: vdso: move data page before code pages"), the
same issue exists on riscv, testcase is shown below, make sure that vdso.so is
bigger than page size,
struct timespec tp;
clock_gettime(5, &tp);
printf("tv_sec: %ld, tv_nsec: %ld\n", tp.tv_sec, tp.tv_nsec);
without this patch, test result : tv_sec: 0, tv_nsec: 0
with this patch, test result : tv_sec: 1629271537, tv_nsec: 748000000
Move the vdso data page in front of the VDSO area to fix the issue.
Fixes: ad5d1122b82fb ("riscv: use vDSO common flow to reduce the latency of the time-related functions")
Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/include/asm/vdso.h')
| -rw-r--r-- | arch/riscv/include/asm/vdso.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/vdso.h b/arch/riscv/include/asm/vdso.h index a4a979c89ea0..208e31bc5d1c 100644 --- a/arch/riscv/include/asm/vdso.h +++ b/arch/riscv/include/asm/vdso.h @@ -22,6 +22,8 @@ */ #ifdef CONFIG_MMU +#define __VVAR_PAGES 1 + #ifndef __ASSEMBLY__ #include <generated/vdso-offsets.h> |