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Peter Anvin" , Ingo Molnar , Oleg Nesterov , Russell King , Thomas Bogendoerfer , Thomas Gleixner , Vincenzo Frascino , Will Deacon , x86@kernel.org Subject: [PATCH 11/19] mm/mmap: Make vm_special_mapping::mremap return void Date: Sun, 8 Nov 2020 05:17:21 +0000 Message-Id: <20201108051730.2042693-12-dima@arista.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201108051730.2042693-1-dima@arista.com> References: <20201108051730.2042693-1-dima@arista.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Previously .mremap() callback needed (int) return to provide way to restrict resizing of a special mapping. Now it's restricted by providing .may_split = special_mapping_split. Removing (int) return simplifies further changes to special_mapping_mremap() as it won't need save ret code from the callback. Also, it removes needless `return 0` from callbacks. Signed-off-by: Dmitry Safonov --- arch/arm/kernel/process.c | 3 +-- arch/arm64/kernel/vdso.c | 4 +--- arch/mips/vdso/genvdso.c | 3 +-- arch/x86/entry/vdso/vma.c | 4 +--- include/linux/mm_types.h | 2 +- mm/mmap.c | 2 +- 6 files changed, 6 insertions(+), 12 deletions(-) diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c index 0e90cba8ac7a..5f4eced738f5 100644 --- a/arch/arm/kernel/process.c +++ b/arch/arm/kernel/process.c @@ -376,11 +376,10 @@ static unsigned long sigpage_addr(const struct mm_struct *mm, static struct page *signal_page; extern struct page *get_signal_page(void); -static int sigpage_mremap(const struct vm_special_mapping *sm, +static void sigpage_mremap(const struct vm_special_mapping *sm, struct vm_area_struct *new_vma) { current->mm->context.sigpage = new_vma->vm_start; - return 0; } static const struct vm_special_mapping sigpage_mapping = { diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c index 666338724a07..91c1b7c716b7 100644 --- a/arch/arm64/kernel/vdso.c +++ b/arch/arm64/kernel/vdso.c @@ -78,12 +78,10 @@ static union { } vdso_data_store __page_aligned_data; struct vdso_data *vdso_data = vdso_data_store.data; -static int vdso_mremap(const struct vm_special_mapping *sm, +static void vdso_mremap(const struct vm_special_mapping *sm, struct vm_area_struct *new_vma) { current->mm->context.vdso = (void *)new_vma->vm_start; - - return 0; } static int __vdso_init(enum vdso_abi abi) diff --git a/arch/mips/vdso/genvdso.c b/arch/mips/vdso/genvdso.c index 09e30eb4be86..0303d30cde03 100644 --- a/arch/mips/vdso/genvdso.c +++ b/arch/mips/vdso/genvdso.c @@ -259,13 +259,12 @@ int main(int argc, char **argv) fprintf(out_file, "#include \n"); fprintf(out_file, "#include \n"); fprintf(out_file, "#include \n"); - fprintf(out_file, "static int vdso_mremap(\n"); + fprintf(out_file, "static void vdso_mremap(\n"); fprintf(out_file, " const struct vm_special_mapping *sm,\n"); fprintf(out_file, " struct vm_area_struct *new_vma)\n"); fprintf(out_file, "{\n"); fprintf(out_file, " current->mm->context.vdso =\n"); fprintf(out_file, " (void *)(new_vma->vm_start);\n"); - fprintf(out_file, " return 0;\n"); fprintf(out_file, "}\n"); /* Write out the stripped VDSO data. */ diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c index 5b9020742e66..65780a0164e3 100644 --- a/arch/x86/entry/vdso/vma.c +++ b/arch/x86/entry/vdso/vma.c @@ -86,15 +86,13 @@ static void vdso_fix_landing(const struct vdso_image *image, #endif } -static int vdso_mremap(const struct vm_special_mapping *sm, +static void vdso_mremap(const struct vm_special_mapping *sm, struct vm_area_struct *new_vma) { const struct vdso_image *image = current->mm->context.vdso_image; vdso_fix_landing(image, new_vma); current->mm->context.vdso = (void __user *)new_vma->vm_start; - - return 0; } #ifdef CONFIG_TIME_NS diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 6a6b078b9d6a..b035caff6abe 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -772,7 +772,7 @@ struct vm_special_mapping { struct vm_area_struct *vma, struct vm_fault *vmf); - int (*mremap)(const struct vm_special_mapping *sm, + void (*mremap)(const struct vm_special_mapping *sm, struct vm_area_struct *new_vma); }; diff --git a/mm/mmap.c b/mm/mmap.c index 61f72b09d990..2376f3972f13 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -3434,7 +3434,7 @@ static int special_mapping_mremap(struct vm_area_struct *new_vma, return -EFAULT; if (sm->mremap) - return sm->mremap(sm, new_vma); + sm->mremap(sm, new_vma); return 0; } -- 2.28.0