[PATCH mm-unstable v2 07/16] mm: loongarch: Introduce arch_mmap_hint()
From: Kalesh Singh <hidden>
Date: 2024-12-11 23:28:11
Also in:
linux-alpha, linux-arm-kernel, linux-mips, linux-mm, linux-s390, linux-sh, lkml, loongarch, sparclinux
Subsystem:
loongarch, the rest · Maintainers:
Huacai Chen, Linus Torvalds
Introduce loongarch arch_mmap_hint() and define HAVE_ARCH_MMAP_HINT.
This is a preparatory patch, no functional change is introduced.
Signed-off-by: Kalesh Singh <redacted>
---
Changes in v2:
- MAP_FIXED case is also handled in arch_mmap_hint() since this is just a
special case of the hint addr being "enforced", per Yang Shi.
- Consolidate error handling in arch_mmap_hint().
arch/loongarch/include/asm/pgtable.h | 1 +
arch/loongarch/mm/mmap.c | 49 +++++++++++++++-------------
2 files changed, 28 insertions(+), 22 deletions(-)
diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h
index da346733a1da..326a6c4b7488 100644
--- a/arch/loongarch/include/asm/pgtable.h
+++ b/arch/loongarch/include/asm/pgtable.h@@ -624,6 +624,7 @@ static inline long pmd_protnone(pmd_t pmd) */ #define HAVE_ARCH_UNMAPPED_AREA #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN +#define HAVE_ARCH_MMAP_HINT #endif /* !__ASSEMBLY__ */
diff --git a/arch/loongarch/mm/mmap.c b/arch/loongarch/mm/mmap.c
index 914e82ff3f65..9e57bb27642f 100644
--- a/arch/loongarch/mm/mmap.c
+++ b/arch/loongarch/mm/mmap.c@@ -17,15 +17,11 @@ enum mmap_allocation_direction {UP, DOWN}; -static unsigned long arch_get_unmapped_area_common(struct file *filp, - unsigned long addr0, unsigned long len, unsigned long pgoff, - unsigned long flags, enum mmap_allocation_direction dir) +unsigned long arch_mmap_hint(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, + unsigned long flags) { - struct mm_struct *mm = current->mm; - struct vm_area_struct *vma; - unsigned long addr = addr0; - int do_color_align; - struct vm_unmapped_area_info info = {}; + bool do_color_align; if (unlikely(len > TASK_SIZE)) return -ENOMEM;
@@ -45,22 +41,31 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp, return addr; } - do_color_align = 0; - if (filp || (flags & MAP_SHARED)) - do_color_align = 1; + do_color_align = filp || (flags & MAP_SHARED); + + if (do_color_align) + addr = COLOUR_ALIGN(addr, pgoff); + else + addr = PAGE_ALIGN(addr); + + return generic_mmap_hint(filp, addr, len, pgoff, flags); +} + +static unsigned long arch_get_unmapped_area_common(struct file *filp, + unsigned long addr0, unsigned long len, unsigned long pgoff, + unsigned long flags, enum mmap_allocation_direction dir) +{ + struct mm_struct *mm = current->mm; + unsigned long addr = addr0; + bool do_color_align; + struct vm_unmapped_area_info info = {}; /* requesting a specific address */ - if (addr) { - if (do_color_align) - addr = COLOUR_ALIGN(addr, pgoff); - else - addr = PAGE_ALIGN(addr); - - vma = find_vma(mm, addr); - if (TASK_SIZE - len >= addr && - (!vma || addr + len <= vm_start_gap(vma))) - return addr; - } + addr = arch_mmap_hint(filp, addr, len, pgoff, flags); + if (addr) + return addr; + + do_color_align = filp || (flags & MAP_SHARED); info.length = len; info.align_mask = do_color_align ? (PAGE_MASK & SHM_ALIGN_MASK) : 0;
--
2.47.0.338.g60cca15819-goog