TWxSoftware/twx-linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

riscv: Pass patch_text() the length in bytes

Browse Source 
patch_text_nosync() already handles an arbitrary length of code, so this
removes a superfluous loop and reduces the number of icache flushes.

Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240327160520.791322-6-samuel.holland@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Samuel Holland
2024-03-27 09:04:44 -07:00
committed by Palmer Dabbelt
parent 5080ca0fe9
commit 51781ce8f4
4 changed files with 20 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/riscv/net/bpf_jit_comp64.c
+4 -3
View File
@@ -16,6 +16,7 @@
#include "bpf_jit.h"
#define RV_FENTRY_NINSNS 2
#define RV_FENTRY_NBYTES (RV_FENTRY_NINSNS * 4)
#define RV_REG_TCC RV_REG_A6
#define RV_REG_TCC_SAVED RV_REG_S6 /* Store A6 in S6 if program do calls */
@@ -672,7 +673,7 @@ int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type poke_type,
if (ret)
return ret;
if (memcmp(ip, old_insns, RV_FENTRY_NINSNS * 4))
if (memcmp(ip, old_insns, RV_FENTRY_NBYTES))
return -EFAULT;
ret = gen_jump_or_nops(new_addr, ip, new_insns, is_call);
@@ -681,8 +682,8 @@ int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type poke_type,
cpus_read_lock();
mutex_lock(&text_mutex);
if (memcmp(ip, new_insns, RV_FENTRY_NINSNS * 4))
ret = patch_text(ip, new_insns, RV_FENTRY_NINSNS);
if (memcmp(ip, new_insns, RV_FENTRY_NBYTES))
ret = patch_text(ip, new_insns, RV_FENTRY_NBYTES);
mutex_unlock(&text_mutex);
cpus_read_unlock();