[PATCH 2/5] arm64: vdso: Remove redundant calls to flush_dcache_page()
From: Will Deacon <will@kernel.org>
Date: 2021-03-18 17:09:42
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
flush_dcache_page() ensures that the 'PG_dcache_clean' flag for its 'page' argument is clear so that cache maintenance will be performed if the page is mapped into userspace with execute permissions. Newly allocated pages have this flag clear, so there is no need to call flush_dcache_page() for the compat vdso or signal pages. Remove the redundant calls. Signed-off-by: Will Deacon <will@kernel.org> --- arch/arm64/kernel/vdso.c | 2 -- 1 file changed, 2 deletions(-)
diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c
index 2d057a4dc787..421411981dc3 100644
--- a/arch/arm64/kernel/vdso.c
+++ b/arch/arm64/kernel/vdso.c@@ -306,7 +306,6 @@ static int aarch32_alloc_kuser_vdso_page(void) memcpy((void *)(vdso_page + 0x1000 - kuser_sz), __kuser_helper_start, kuser_sz); aarch32_vectors_page = virt_to_page(vdso_page); - flush_dcache_page(aarch32_vectors_page); return 0; }
@@ -322,7 +321,6 @@ static int aarch32_alloc_sigpage(void) memcpy((void *)sigpage, __aarch32_sigret_code_start, sigret_sz); aarch32_sig_page = virt_to_page(sigpage); - flush_dcache_page(aarch32_sig_page); return 0; }
--
2.31.0.rc2.261.g7f71774620-goog
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