[PATCH v3 09/17] arm64, trans_pgd: add trans_pgd_create_empty
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STALE2560d
SUPERSEDED
From: Pavel Tatashin <pasha.tatashin@soleen.com>
Date: 2019-08-21 18:33:07
Also in:
kexec, linux-mm, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Revision v3 of 16 in this series.
Revisions (16)
- v2 [diff vs current]
- v3 current
- v4 [diff vs current]
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- v12 [diff vs current]
- v13 [diff vs current]
- v1 [diff vs current]
- v15 [diff vs current]
- v16 [diff vs current]
- v17 [diff vs current]
- v18 [diff vs current]
This functions returns a zeroed trans_pgd using the allocator that is specified in the info argument. trans_pgds should be created by using this function. Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com> --- arch/arm64/include/asm/trans_pgd.h | 3 +++ arch/arm64/kernel/hibernate.c | 6 +++--- arch/arm64/mm/trans_pgd.c | 12 ++++++++++++ 3 files changed, 18 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/include/asm/trans_pgd.h b/arch/arm64/include/asm/trans_pgd.h
index e3d022b1b526..26e5a63676b5 100644
--- a/arch/arm64/include/asm/trans_pgd.h
+++ b/arch/arm64/include/asm/trans_pgd.h@@ -40,6 +40,9 @@ struct trans_pgd_info { unsigned long trans_flags; }; +/* Create and empty trans_pgd page table */ +int trans_pgd_create_empty(struct trans_pgd_info *info, pgd_t **trans_pgd); + int trans_pgd_create_copy(pgd_t **dst_pgdp, unsigned long start, unsigned long end);
diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
index 17426dc8cb54..8c2641a9bb09 100644
--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c@@ -216,9 +216,9 @@ static int create_safe_exec_page(void *src_start, size_t length, memcpy(page, src_start, length); __flush_icache_range((unsigned long)page, (unsigned long)page + length); - trans_pgd = (void *)get_safe_page(GFP_ATOMIC); - if (!trans_pgd) - return -ENOMEM; + rc = trans_pgd_create_empty(&trans_info, &trans_pgd); + if (rc) + return rc; rc = trans_pgd_map_page(&trans_info, trans_pgd, page, dst_addr, PAGE_KERNEL_EXEC);
diff --git a/arch/arm64/mm/trans_pgd.c b/arch/arm64/mm/trans_pgd.c
index dbabccd78cc4..ece797aa1841 100644
--- a/arch/arm64/mm/trans_pgd.c
+++ b/arch/arm64/mm/trans_pgd.c@@ -164,6 +164,18 @@ static int copy_page_tables(pgd_t *dst_pgdp, unsigned long start, return 0; } +int trans_pgd_create_empty(struct trans_pgd_info *info, pgd_t **trans_pgd) +{ + pgd_t *dst_pgdp = trans_alloc(info); + + if (!dst_pgdp) + return -ENOMEM; + + *trans_pgd = dst_pgdp; + + return 0; +} + int trans_pgd_create_copy(pgd_t **dst_pgdp, unsigned long start, unsigned long end) {
--
2.23.0
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