From mboxrd@z Thu Jan 1 00:00:00 1970 From: takahiro.akashi@linaro.org (AKASHI Takahiro) Date: Mon, 3 Apr 2017 11:24:33 +0900 Subject: [PATCH v35 05/14] arm64: mm: add set_memory_valid() In-Reply-To: <20170403022139.12383-1-takahiro.akashi@linaro.org> References: <20170403022139.12383-1-takahiro.akashi@linaro.org> Message-ID: <20170403022440.12515-3-takahiro.akashi@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org This function validates and invalidates PTE entries, and will be utilized in kdump to protect loaded crash dump kernel image. Signed-off-by: AKASHI Takahiro Reviewed-by: Ard Biesheuvel --- arch/arm64/include/asm/cacheflush.h | 1 + arch/arm64/mm/pageattr.c | 15 +++++++++------ 2 files changed, 10 insertions(+), 6 deletions(-) diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h index 5a2a6ee65f65..728f933cef8c 100644 --- a/arch/arm64/include/asm/cacheflush.h +++ b/arch/arm64/include/asm/cacheflush.h @@ -154,5 +154,6 @@ int set_memory_ro(unsigned long addr, int numpages); int set_memory_rw(unsigned long addr, int numpages); int set_memory_x(unsigned long addr, int numpages); int set_memory_nx(unsigned long addr, int numpages); +int set_memory_valid(unsigned long addr, unsigned long size, int enable); #endif diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index 8def55e7249b..3212ee0558f6 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -125,20 +125,23 @@ int set_memory_x(unsigned long addr, int numpages) } EXPORT_SYMBOL_GPL(set_memory_x); -#ifdef CONFIG_DEBUG_PAGEALLOC -void __kernel_map_pages(struct page *page, int numpages, int enable) +int set_memory_valid(unsigned long addr, int numpages, int enable) { - unsigned long addr = (unsigned long) page_address(page); - if (enable) - __change_memory_common(addr, PAGE_SIZE * numpages, + return __change_memory_common(addr, PAGE_SIZE * numpages, __pgprot(PTE_VALID), __pgprot(0)); else - __change_memory_common(addr, PAGE_SIZE * numpages, + return __change_memory_common(addr, PAGE_SIZE * numpages, __pgprot(0), __pgprot(PTE_VALID)); } + +#ifdef CONFIG_DEBUG_PAGEALLOC +void __kernel_map_pages(struct page *page, int numpages, int enable) +{ + set_memory_valid((unsigned long)page_address(page), numpages, enable); +} #ifdef CONFIG_HIBERNATION /* * When built with CONFIG_DEBUG_PAGEALLOC and CONFIG_HIBERNATION, this function -- 2.11.1