[PATCH] kexec: Avoid calculating array size twice

Simon Horman
2023-05-25T14:26:36Z

Avoid calculating array size twice in kexec_purgatory_setup_sechdrs().
Once using array_size(), and once open-coded.

Flagged by Coccinelle:

.../kexec_file.c:881:8-25: WARNING: array_size is already used (line 877) to compute the same size

No functional change intended.
Compile tested only.

Signed-off-by: Simon Horman <horms@kernel.org>
---
kernel/kexec_file.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index f989f5f1933b..3f5677679744 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -867,6 +867,7 @@ static int kexec_purgatory_setup_sechdrs(struct purgatory_info *pi,
{
unsigned long bss_addr;
unsigned long offset;
+ size_t sechdrs_size;
Elf_Shdr *sechdrs;
int i;

@@ -874,11 +875,11 @@ static int kexec_purgatory_setup_sechdrs(struct purgatory_info *pi,
* The section headers in kexec_purgatory are read-only. In order to
* have them modifiable make a temporary copy.
*/
- sechdrs = vzalloc(array_size(sizeof(Elf_Shdr), pi->ehdr->e_shnum));
+ sechdrs_size = array_size(sizeof(Elf_Shdr), pi->ehdr->e_shnum);
+ sechdrs = vzalloc(sechdrs_size);
if (!sechdrs)
return -ENOMEM;
- memcpy(sechdrs, (void *)pi->ehdr + pi->ehdr->e_shoff,
- pi->ehdr->e_shnum * sizeof(Elf_Shdr));
+ memcpy(sechdrs, (void *)pi->ehdr + pi->ehdr->e_shoff, sechdrs_size);
pi->sechdrs = sechdrs;

offset = 0;