diff mbox series

[RFC,bpf-next,2/3] bpf, x64: Load tail_call_cnt pointer

Message ID 20231005145814.83122-3-hffilwlqm@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf, x64: Fix tailcall hierarchy | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR pending PR summary
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bpf/vmtest-bpf-next-VM_Test-11 pending Logs for test_progs on s390x with gcc
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bpf/vmtest-bpf-next-VM_Test-12 fail Logs for test_progs on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-17 fail Logs for test_progs_no_alu32 on x86_64 with llvm-16
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bpf/vmtest-bpf-next-VM_Test-10 fail Logs for test_progs on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-14 fail Logs for test_progs_no_alu32 on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-18 success Logs for test_progs_no_alu32_parallel on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-21 success Logs for test_progs_parallel on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-15 fail Logs for test_progs_no_alu32 on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-7 success Logs for test_maps on s390x with gcc
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 9 this patch: 9
netdev/cc_maintainers warning 17 maintainers not CCed: bp@alien8.de tglx@linutronix.de martin.lau@linux.dev jolsa@kernel.org haoluo@google.com davem@davemloft.net sdf@google.com mingo@redhat.com john.fastabend@gmail.com yonghong.song@linux.dev netdev@vger.kernel.org x86@kernel.org dsahern@kernel.org hpa@zytor.com kpsingh@kernel.org song@kernel.org dave.hansen@linux.intel.com
netdev/build_clang success Errors and warnings before: 1364 this patch: 1364
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1365 this patch: 1365
netdev/checkpatch warning WARNING: line length of 83 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Leon Hwang Oct. 5, 2023, 2:58 p.m. UTC 
Rename RESTORE_TAIL_CALL_CNT() to LOAD_TAIL_CALL_CNT_PTR().

With previous commit, rax is used to propagate tail_call_cnt pointer
instead of tail_call_cnt. So, RESTORE_TAIL_CALL_CNT() is misleading.

Signed-off-by: Leon Hwang <hffilwlqm@gmail.com>
---
 arch/x86/net/bpf_jit_comp.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 8ad6368353c2b..7a8397a60ea1e 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -1102,7 +1102,7 @@  static void emit_shiftx(u8 **pprog, u32 dst_reg, u8 src_reg, bool is64, u8 op)
 #define INSN_SZ_DIFF (((addrs[i] - addrs[i - 1]) - (prog - temp)))
 
 /* mov rax, qword ptr [rbp - rounded_stack_depth - 8] */
-#define RESTORE_TAIL_CALL_CNT(stack)				\
+#define LOAD_TAIL_CALL_CNT_PTR(stack)				\
 	EMIT3_off32(0x48, 0x8B, 0x85, -round_up(stack, 8) - 8)
 
 static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image, u8 *rw_image,
@@ -1722,7 +1722,7 @@  st:			if (is_imm8(insn->off))
 
 			func = (u8 *) __bpf_call_base + imm32;
 			if (tail_call_reachable) {
-				RESTORE_TAIL_CALL_CNT(bpf_prog->aux->stack_depth);
+				LOAD_TAIL_CALL_CNT_PTR(bpf_prog->aux->stack_depth);
 				if (!imm32)
 					return -EINVAL;
 				offs = 7 + x86_call_depth_emit_accounting(&prog, func);
@@ -2624,10 +2624,10 @@  int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i
 		save_args(m, &prog, arg_stack_off, true);
 
 		if (flags & BPF_TRAMP_F_TAIL_CALL_CTX)
-			/* Before calling the original function, restore the
-			 * tail_call_cnt from stack to rax.
+			/* Before calling the original function, load the
+			 * tail_call_cnt_ptr to rax.
 			 */
-			RESTORE_TAIL_CALL_CNT(stack_size);
+			LOAD_TAIL_CALL_CNT_PTR(stack_size);
 
 		if (flags & BPF_TRAMP_F_ORIG_STACK) {
 			emit_ldx(&prog, BPF_DW, BPF_REG_6, BPF_REG_FP, 8);
@@ -2683,10 +2683,10 @@  int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i
 			goto cleanup;
 		}
 	} else if (flags & BPF_TRAMP_F_TAIL_CALL_CTX)
-		/* Before running the original function, restore the
-		 * tail_call_cnt from stack to rax.
+		/* Before running the original function, load the
+		 * tail_call_cnt_ptr to rax.
 		 */
-		RESTORE_TAIL_CALL_CNT(stack_size);
+		LOAD_TAIL_CALL_CNT_PTR(stack_size);
 
 	/* restore return value of orig_call or fentry prog back into RAX */
 	if (save_ret)