linux-kernel - [PATCH 2/2] gcov: re-drop support for clang-10

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Date:   Wed,  7 Apr 2021 11:54:56 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Peter Oberparleiter <oberpar@...ux.ibm.com>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fangrui Song <maskray@...gle.com>,
        Prasad Sodagudi <psodagud@...cinc.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH 2/2] gcov: re-drop support for clang-10

LLVM changed the expected function signatures for
llvm_gcda_emit_function() in the clang-11 release.  Drop the older
implementations and require folks to upgrade their compiler if they're
interested in GCOV support.

Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
---
 kernel/gcov/clang.c | 40 ----------------------------------------
 1 file changed, 40 deletions(-)

diff --git a/kernel/gcov/clang.c b/kernel/gcov/clang.c
index 1747204541bf..78c4dc751080 100644
--- a/kernel/gcov/clang.c
+++ b/kernel/gcov/clang.c
@@ -69,9 +69,6 @@ struct gcov_fn_info {
 
 	u32 ident;
 	u32 checksum;
-#if CONFIG_CLANG_VERSION < 110000
-	u8 use_extra_checksum;
-#endif
 	u32 cfg_checksum;
 
 	u32 num_counters;
@@ -113,23 +110,6 @@ void llvm_gcda_start_file(const char *orig_filename, u32 version, u32 checksum)
 }
 EXPORT_SYMBOL(llvm_gcda_start_file);
 
-#if CONFIG_CLANG_VERSION < 110000
-void llvm_gcda_emit_function(u32 ident, u32 func_checksum,
-		u8 use_extra_checksum, u32 cfg_checksum)
-{
-	struct gcov_fn_info *info = kzalloc(sizeof(*info), GFP_KERNEL);
-
-	if (!info)
-		return;
-
-	INIT_LIST_HEAD(&info->head);
-	info->ident = ident;
-	info->checksum = func_checksum;
-	info->use_extra_checksum = use_extra_checksum;
-	info->cfg_checksum = cfg_checksum;
-	list_add_tail(&info->head, &current_info->functions);
-}
-#else
 void llvm_gcda_emit_function(u32 ident, u32 func_checksum, u32 cfg_checksum)
 {
 	struct gcov_fn_info *info = kzalloc(sizeof(*info), GFP_KERNEL);
@@ -143,7 +123,6 @@ void llvm_gcda_emit_function(u32 ident, u32 func_checksum, u32 cfg_checksum)
 	info->cfg_checksum = cfg_checksum;
 	list_add_tail(&info->head, &current_info->functions);
 }
-#endif
 EXPORT_SYMBOL(llvm_gcda_emit_function);
 
 void llvm_gcda_emit_arcs(u32 num_counters, u64 *counters)
@@ -274,16 +253,8 @@ int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info *info2)
 		!list_is_last(&fn_ptr2->head, &info2->functions)) {
 		if (fn_ptr1->checksum != fn_ptr2->checksum)
 			return false;
-#if CONFIG_CLANG_VERSION < 110000
-		if (fn_ptr1->use_extra_checksum != fn_ptr2->use_extra_checksum)
-			return false;
-		if (fn_ptr1->use_extra_checksum &&
-			fn_ptr1->cfg_checksum != fn_ptr2->cfg_checksum)
-			return false;
-#else
 		if (fn_ptr1->cfg_checksum != fn_ptr2->cfg_checksum)
 			return false;
-#endif
 		fn_ptr1 = list_next_entry(fn_ptr1, head);
 		fn_ptr2 = list_next_entry(fn_ptr2, head);
 	}
@@ -403,21 +374,10 @@ size_t convert_to_gcda(char *buffer, struct gcov_info *info)
 		u32 i;
 
 		pos += store_gcov_u32(buffer, pos, GCOV_TAG_FUNCTION);
-#if CONFIG_CLANG_VERSION < 110000
-		pos += store_gcov_u32(buffer, pos,
-			fi_ptr->use_extra_checksum ? 3 : 2);
-#else
 		pos += store_gcov_u32(buffer, pos, 3);
-#endif
 		pos += store_gcov_u32(buffer, pos, fi_ptr->ident);
 		pos += store_gcov_u32(buffer, pos, fi_ptr->checksum);
-#if CONFIG_CLANG_VERSION < 110000
-		if (fi_ptr->use_extra_checksum)
-			pos += store_gcov_u32(buffer, pos, fi_ptr->cfg_checksum);
-#else
 		pos += store_gcov_u32(buffer, pos, fi_ptr->cfg_checksum);
-#endif
-
 		pos += store_gcov_u32(buffer, pos, GCOV_TAG_COUNTER_BASE);
 		pos += store_gcov_u32(buffer, pos, fi_ptr->num_counters * 2);
 		for (i = 0; i < fi_ptr->num_counters; i++)
-- 
2.31.1.295.g9ea45b61b8-goog