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authorLinus Torvalds <torvalds@linux-foundation.org>2021-11-09 21:11:53 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-11-09 21:11:53 +0300
commit59a2ceeef6d6bb8f68550fdbd84246b74a99f06b (patch)
treed8302a240dfe56defb8d56df555bb046a5a7bb5c /lib
parentd2f38a3c6507b2520101f9a3807ed98f1bdc545a (diff)
parent0e9beb8a96f21a6df1579cb3a679e150e3269d80 (diff)
downloadlinux-59a2ceeef6d6bb8f68550fdbd84246b74a99f06b.tar.xz
Merge branch 'akpm' (patches from Andrew)
Merge more updates from Andrew Morton: "87 patches. Subsystems affected by this patch series: mm (pagecache and hugetlb), procfs, misc, MAINTAINERS, lib, checkpatch, binfmt, kallsyms, ramfs, init, codafs, nilfs2, hfs, crash_dump, signals, seq_file, fork, sysvfs, kcov, gdb, resource, selftests, and ipc" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (87 commits) ipc/ipc_sysctl.c: remove fallback for !CONFIG_PROC_SYSCTL ipc: check checkpoint_restore_ns_capable() to modify C/R proc files selftests/kselftest/runner/run_one(): allow running non-executable files virtio-mem: disallow mapping virtio-mem memory via /dev/mem kernel/resource: disallow access to exclusive system RAM regions kernel/resource: clean up and optimize iomem_is_exclusive() scripts/gdb: handle split debug for vmlinux kcov: replace local_irq_save() with a local_lock_t kcov: avoid enable+disable interrupts if !in_task() kcov: allocate per-CPU memory on the relevant node Documentation/kcov: define `ip' in the example Documentation/kcov: include types.h in the example sysv: use BUILD_BUG_ON instead of runtime check kernel/fork.c: unshare(): use swap() to make code cleaner seq_file: fix passing wrong private data seq_file: move seq_escape() to a header signal: remove duplicate include in signal.h crash_dump: remove duplicate include in crash_dump.h crash_dump: fix boolreturn.cocci warning hfs/hfsplus: use WARN_ON for sanity check ...
Diffstat (limited to 'lib')
-rw-r--r--lib/scatterlist.c11
-rw-r--r--lib/stackdepot.c46
-rw-r--r--lib/vsprintf.c3
3 files changed, 51 insertions, 9 deletions
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index abb3432ed744..d5e82e4a57ad 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -828,8 +828,7 @@ static bool sg_miter_get_next_page(struct sg_mapping_iter *miter)
* stops @miter.
*
* Context:
- * Don't care if @miter is stopped, or not proceeded yet.
- * Otherwise, preemption disabled if the SG_MITER_ATOMIC is set.
+ * Don't care.
*
* Returns:
* true if @miter contains the valid mapping. false if end of sg
@@ -865,8 +864,7 @@ EXPORT_SYMBOL(sg_miter_skip);
* @miter->addr and @miter->length point to the current mapping.
*
* Context:
- * Preemption disabled if SG_MITER_ATOMIC. Preemption must stay disabled
- * till @miter is stopped. May sleep if !SG_MITER_ATOMIC.
+ * May sleep if !SG_MITER_ATOMIC.
*
* Returns:
* true if @miter contains the next mapping. false if end of sg
@@ -906,8 +904,7 @@ EXPORT_SYMBOL(sg_miter_next);
* need to be released during iteration.
*
* Context:
- * Preemption disabled if the SG_MITER_ATOMIC is set. Don't care
- * otherwise.
+ * Don't care otherwise.
*/
void sg_miter_stop(struct sg_mapping_iter *miter)
{
@@ -922,7 +919,7 @@ void sg_miter_stop(struct sg_mapping_iter *miter)
flush_dcache_page(miter->page);
if (miter->__flags & SG_MITER_ATOMIC) {
- WARN_ON_ONCE(preemptible());
+ WARN_ON_ONCE(!pagefault_disabled());
kunmap_atomic(miter->addr);
} else
kunmap(miter->page);
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 09485dc5bd12..b437ae79aca1 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -214,6 +214,49 @@ static inline struct stack_record *find_stack(struct stack_record *bucket,
}
/**
+ * stack_depot_snprint - print stack entries from a depot into a buffer
+ *
+ * @handle: Stack depot handle which was returned from
+ * stack_depot_save().
+ * @buf: Pointer to the print buffer
+ *
+ * @size: Size of the print buffer
+ *
+ * @spaces: Number of leading spaces to print
+ *
+ * Return: Number of bytes printed.
+ */
+int stack_depot_snprint(depot_stack_handle_t handle, char *buf, size_t size,
+ int spaces)
+{
+ unsigned long *entries;
+ unsigned int nr_entries;
+
+ nr_entries = stack_depot_fetch(handle, &entries);
+ return nr_entries ? stack_trace_snprint(buf, size, entries, nr_entries,
+ spaces) : 0;
+}
+EXPORT_SYMBOL_GPL(stack_depot_snprint);
+
+/**
+ * stack_depot_print - print stack entries from a depot
+ *
+ * @stack: Stack depot handle which was returned from
+ * stack_depot_save().
+ *
+ */
+void stack_depot_print(depot_stack_handle_t stack)
+{
+ unsigned long *entries;
+ unsigned int nr_entries;
+
+ nr_entries = stack_depot_fetch(stack, &entries);
+ if (nr_entries > 0)
+ stack_trace_print(entries, nr_entries, 0);
+}
+EXPORT_SYMBOL_GPL(stack_depot_print);
+
+/**
* stack_depot_fetch - Fetch stack entries from a depot
*
* @handle: Stack depot handle which was returned from
@@ -231,6 +274,9 @@ unsigned int stack_depot_fetch(depot_stack_handle_t handle,
struct stack_record *stack;
*entries = NULL;
+ if (!handle)
+ return 0;
+
if (parts.slabindex > depot_index) {
WARN(1, "slab index %d out of bounds (%d) for stack id %08x\n",
parts.slabindex, depot_index, handle);
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index f90f91d83920..58d5e567f836 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -53,8 +53,7 @@
#include <linux/string_helpers.h>
#include "kstrtox.h"
-static unsigned long long simple_strntoull(const char *startp, size_t max_chars,
- char **endp, unsigned int base)
+static noinline unsigned long long simple_strntoull(const char *startp, size_t max_chars, char **endp, unsigned int base)
{
const char *cp;
unsigned long long result = 0ULL;