[PATCH mm-unstable 14/17] mm: xtensa: Introduce arch_mmap_hint()
From: Kalesh Singh <hidden>
Date: 2024-12-10 02:41:49
Also in:
linux-alpha, linux-mips, linux-mm, linux-s390, linux-sh, linuxppc-dev, lkml, loongarch, sparclinux
Subsystem:
tensilica xtensa port (xtensa), the rest · Maintainers:
Chris Zankel, Max Filippov, Linus Torvalds
Introduce xtensa arch_mmap_hint() and define HAVE_ARCH_MMAP_HINT. If a sufficiently sized hole doesn't exist at the hint address, fallback to searching the entire valid VA space instead of only the VA space above the hint address. Signed-off-by: Kalesh Singh <redacted> --- arch/xtensa/include/asm/pgtable.h | 1 + arch/xtensa/kernel/syscall.c | 26 ++++++++++++++++++++++++-- 2 files changed, 25 insertions(+), 2 deletions(-)
diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h
index 1647a7cc3fbf..31b7da0805ec 100644
--- a/arch/xtensa/include/asm/pgtable.h
+++ b/arch/xtensa/include/asm/pgtable.h@@ -425,5 +425,6 @@ void update_mmu_tlb_range(struct vm_area_struct *vma, * SHM area cache aliasing for userland. */ #define HAVE_ARCH_UNMAPPED_AREA +#define HAVE_ARCH_MMAP_HINT #endif /* _XTENSA_PGTABLE_H */
diff --git a/arch/xtensa/kernel/syscall.c b/arch/xtensa/kernel/syscall.c
index dc54f854c2f5..353cce1ac9f1 100644
--- a/arch/xtensa/kernel/syscall.c
+++ b/arch/xtensa/kernel/syscall.c@@ -54,6 +54,24 @@ asmlinkage long xtensa_fadvise64_64(int fd, int advice, } #ifdef CONFIG_MMU +unsigned long arch_mmap_hint(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, + unsigned long flags) +{ + if (!addr) + return 0; + + if (len > TASK_SIZE) + return 0; + + if (flags & MAP_SHARED) + addr = COLOUR_ALIGN(addr, pgoff); + else + addr = PAGE_ALIGN(addr); + + return generic_mmap_hint(filp, addr, len, pgoff, flags); +} + unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags, vm_flags_t vm_flags)
@@ -73,8 +91,12 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, if (len > TASK_SIZE) return -ENOMEM; - if (!addr) - addr = TASK_UNMAPPED_BASE; + + addr = arch_mmap_hint(filp, addr, len, pgoff, flags); + if (addr) + return addr; + + addr = TASK_UNMAPPED_BASE; if (flags & MAP_SHARED) addr = COLOUR_ALIGN(addr, pgoff);
--
2.47.0.338.g60cca15819-goog