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Message-ID: <20241105155801.1779119-17-brgerst@gmail.com>
Date: Tue, 5 Nov 2024 10:58:01 -0500
From: Brian Gerst <brgerst@...il.com>
To: linux-kernel@...r.kernel.org,
x86@...nel.org
Cc: Ingo Molnar <mingo@...nel.org>,
"H . Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
Borislav Petkov <bp@...en8.de>,
Ard Biesheuvel <ardb@...nel.org>,
Uros Bizjak <ubizjak@...il.com>,
Brian Gerst <brgerst@...il.com>
Subject: [PATCH v5 16/16] kallsyms: Remove KALLSYMS_ABSOLUTE_PERCPU
x86-64 was the only user.
Signed-off-by: Brian Gerst <brgerst@...il.com>
---
init/Kconfig | 5 ---
kernel/kallsyms.c | 12 ++-----
scripts/kallsyms.c | 72 +++++++----------------------------------
scripts/link-vmlinux.sh | 4 ---
4 files changed, 14 insertions(+), 79 deletions(-)
diff --git a/init/Kconfig b/init/Kconfig
index b374c0de5cfd..32db844d00d1 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1846,11 +1846,6 @@ config KALLSYMS_ALL
Say N unless you really need all symbols, or kernel live patching.
-config KALLSYMS_ABSOLUTE_PERCPU
- bool
- depends on KALLSYMS
- default n
-
# end of the "standard kernel features (expert users)" menu
config ARCH_HAS_MEMBARRIER_CALLBACKS
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index a9a0ca605d4a..4198f30aac3c 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -148,16 +148,8 @@ static unsigned int get_symbol_offset(unsigned long pos)
unsigned long kallsyms_sym_address(int idx)
{
- /* values are unsigned offsets if --absolute-percpu is not in effect */
- if (!IS_ENABLED(CONFIG_KALLSYMS_ABSOLUTE_PERCPU))
- return kallsyms_relative_base + (u32)kallsyms_offsets[idx];
-
- /* ...otherwise, positive offsets are absolute values */
- if (kallsyms_offsets[idx] >= 0)
- return kallsyms_offsets[idx];
-
- /* ...and negative offsets are relative to kallsyms_relative_base - 1 */
- return kallsyms_relative_base - 1 - kallsyms_offsets[idx];
+ /* values are unsigned offsets */
+ return kallsyms_relative_base + (u32)kallsyms_offsets[idx];
}
static unsigned int get_symbol_seq(int index)
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 03852da3d249..4b0234e4b12f 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -5,7 +5,7 @@
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
- * Usage: kallsyms [--all-symbols] [--absolute-percpu] in.map > out.S
+ * Usage: kallsyms [--all-symbols] in.map > out.S
*
* Table compression uses all the unused char codes on the symbols and
* maps these to the most used substrings (tokens). For instance, it might
@@ -37,7 +37,6 @@ struct sym_entry {
unsigned long long addr;
unsigned int len;
unsigned int seq;
- bool percpu_absolute;
unsigned char sym[];
};
@@ -55,14 +54,9 @@ static struct addr_range text_ranges[] = {
#define text_range_text (&text_ranges[0])
#define text_range_inittext (&text_ranges[1])
-static struct addr_range percpu_range = {
- "__per_cpu_start", "__per_cpu_end", -1ULL, 0
-};
-
static struct sym_entry **table;
static unsigned int table_size, table_cnt;
static int all_symbols;
-static int absolute_percpu;
static int token_profit[0x10000];
@@ -73,7 +67,7 @@ static unsigned char best_table_len[256];
static void usage(void)
{
- fprintf(stderr, "Usage: kallsyms [--all-symbols] [--absolute-percpu] in.map > out.S\n");
+ fprintf(stderr, "Usage: kallsyms [--all-symbols] in.map > out.S\n");
exit(1);
}
@@ -164,7 +158,6 @@ static struct sym_entry *read_symbol(FILE *in, char **buf, size_t *buf_len)
return NULL;
check_symbol_range(name, addr, text_ranges, ARRAY_SIZE(text_ranges));
- check_symbol_range(name, addr, &percpu_range, 1);
/* include the type field in the symbol name, so that it gets
* compressed together */
@@ -175,7 +168,6 @@ static struct sym_entry *read_symbol(FILE *in, char **buf, size_t *buf_len)
sym->len = len;
sym->sym[0] = type;
strcpy(sym_name(sym), name);
- sym->percpu_absolute = false;
return sym;
}
@@ -319,11 +311,6 @@ static int expand_symbol(const unsigned char *data, int len, char *result)
return total;
}
-static bool symbol_absolute(const struct sym_entry *s)
-{
- return s->percpu_absolute;
-}
-
static int compare_names(const void *a, const void *b)
{
int ret;
@@ -455,22 +442,11 @@ static void write_src(void)
*/
long long offset;
- bool overflow;
-
- if (!absolute_percpu) {
- offset = table[i]->addr - relative_base;
- overflow = offset < 0 || offset > UINT_MAX;
- } else if (symbol_absolute(table[i])) {
- offset = table[i]->addr;
- overflow = offset < 0 || offset > INT_MAX;
- } else {
- offset = relative_base - table[i]->addr - 1;
- overflow = offset < INT_MIN || offset >= 0;
- }
- if (overflow) {
+
+ offset = table[i]->addr - relative_base;
+ if (offset < 0 || offset > UINT_MAX) {
fprintf(stderr, "kallsyms failure: "
- "%s symbol value %#llx out of range in relative mode\n",
- symbol_absolute(table[i]) ? "absolute" : "relative",
+ "relative symbol value %#llx out of range\n",
table[i]->addr);
exit(EXIT_FAILURE);
}
@@ -725,36 +701,15 @@ static void sort_symbols(void)
qsort(table, table_cnt, sizeof(table[0]), compare_symbols);
}
-static void make_percpus_absolute(void)
-{
- unsigned int i;
-
- for (i = 0; i < table_cnt; i++)
- if (symbol_in_range(table[i], &percpu_range, 1)) {
- /*
- * Keep the 'A' override for percpu symbols to
- * ensure consistent behavior compared to older
- * versions of this tool.
- */
- table[i]->sym[0] = 'A';
- table[i]->percpu_absolute = true;
- }
-}
-
/* find the minimum non-absolute symbol address */
static void record_relative_base(void)
{
- unsigned int i;
-
- for (i = 0; i < table_cnt; i++)
- if (!symbol_absolute(table[i])) {
- /*
- * The table is sorted by address.
- * Take the first non-absolute symbol value.
- */
- relative_base = table[i]->addr;
- return;
- }
+ /*
+ * The table is sorted by address.
+ * Take the first symbol value.
+ */
+ if (table_cnt)
+ relative_base = table[0]->addr;
}
int main(int argc, char **argv)
@@ -762,7 +717,6 @@ int main(int argc, char **argv)
while (1) {
static const struct option long_options[] = {
{"all-symbols", no_argument, &all_symbols, 1},
- {"absolute-percpu", no_argument, &absolute_percpu, 1},
{},
};
@@ -779,8 +733,6 @@ int main(int argc, char **argv)
read_map(argv[optind]);
shrink_table();
- if (absolute_percpu)
- make_percpus_absolute();
sort_symbols();
record_relative_base();
optimize_token_table();
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index a9b3f34a78d2..df5f3fbb46f3 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -140,10 +140,6 @@ kallsyms()
kallsymopt="${kallsymopt} --all-symbols"
fi
- if is_enabled CONFIG_KALLSYMS_ABSOLUTE_PERCPU; then
- kallsymopt="${kallsymopt} --absolute-percpu"
- fi
-
info KSYMS "${2}.S"
scripts/kallsyms ${kallsymopt} "${1}" > "${2}.S"
--
2.47.0
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