lkml.org 
[lkml]   [2019]   [Sep]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 05/17] arm64: hibernate: remove gotos in create_safe_exec_page
Date
Usually, gotos are used to handle cleanup after exception, but
in case of create_safe_exec_page there are no clean-ups. So,
simply return the errors directly.

Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: James Morse <james.morse@arm.com>
---
arch/arm64/kernel/hibernate.c | 34 +++++++++++-----------------------
1 file changed, 11 insertions(+), 23 deletions(-)

diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
index 47a861e0cb0c..7bbeb33c700d 100644
--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c
@@ -198,7 +198,6 @@ static int create_safe_exec_page(void *src_start, size_t length,
unsigned long dst_addr,
phys_addr_t *phys_dst_addr)
{
- int rc = 0;
pgd_t *trans_pgd;
pgd_t *pgdp;
pud_t *pudp;
@@ -206,47 +205,37 @@ static int create_safe_exec_page(void *src_start, size_t length,
pte_t *ptep;
unsigned long dst = get_safe_page(GFP_ATOMIC);

- if (!dst) {
- rc = -ENOMEM;
- goto out;
- }
+ if (!dst)
+ return -ENOMEM;

memcpy((void *)dst, src_start, length);
__flush_icache_range(dst, dst + length);

trans_pgd = (void *)get_safe_page(GFP_ATOMIC);
- if (!trans_pgd) {
- rc = -ENOMEM;
- goto out;
- }
+ if (!trans_pgd)
+ return -ENOMEM;

pgdp = pgd_offset_raw(trans_pgd, dst_addr);
if (pgd_none(READ_ONCE(*pgdp))) {
pudp = (void *)get_safe_page(GFP_ATOMIC);
- if (!pudp) {
- rc = -ENOMEM;
- goto out;
- }
+ if (!pudp)
+ return -ENOMEM;
pgd_populate(&init_mm, pgdp, pudp);
}

pudp = pud_offset(pgdp, dst_addr);
if (pud_none(READ_ONCE(*pudp))) {
pmdp = (void *)get_safe_page(GFP_ATOMIC);
- if (!pmdp) {
- rc = -ENOMEM;
- goto out;
- }
+ if (!pmdp)
+ return -ENOMEM;
pud_populate(&init_mm, pudp, pmdp);
}

pmdp = pmd_offset(pudp, dst_addr);
if (pmd_none(READ_ONCE(*pmdp))) {
ptep = (void *)get_safe_page(GFP_ATOMIC);
- if (!ptep) {
- rc = -ENOMEM;
- goto out;
- }
+ if (!ptep)
+ return -ENOMEM;
pmd_populate_kernel(&init_mm, pmdp, ptep);
}

@@ -272,8 +261,7 @@ static int create_safe_exec_page(void *src_start, size_t length,

*phys_dst_addr = virt_to_phys((void *)dst);

-out:
- return rc;
+ return 0;
}

#define dcache_clean_range(start, end) __flush_dcache_area(start, (end - start))
--
2.23.0
\
 
 \ /
  Last update: 2019-09-09 20:14    [W:0.123 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site