From e09b41010ba33a20a87472ee821fa407a5b8da36 Mon Sep 17 00:00:00 2001 From: José Pekkarinen Date: Mon, 11 Apr 2016 10:41:07 +0300 Subject: These changes are the raw update to linux-4.4.6-rt14. Kernel sources are taken from kernel.org, and rt patch from the rt wiki download page. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen --- kernel/fs/seq_file.c | 173 ++++++++++++++++++++++++++++++++------------------- 1 file changed, 108 insertions(+), 65 deletions(-) (limited to 'kernel/fs/seq_file.c') diff --git a/kernel/fs/seq_file.c b/kernel/fs/seq_file.c index 555f82155..e85664b7c 100644 --- a/kernel/fs/seq_file.c +++ b/kernel/fs/seq_file.c @@ -12,6 +12,8 @@ #include #include #include +#include +#include #include #include @@ -24,12 +26,17 @@ static void seq_set_overflow(struct seq_file *m) static void *seq_buf_alloc(unsigned long size) { void *buf; + gfp_t gfp = GFP_KERNEL; /* - * __GFP_NORETRY to avoid oom-killings with high-order allocations - - * it's better to fall back to vmalloc() than to kill things. + * For high order allocations, use __GFP_NORETRY to avoid oom-killing - + * it's better to fall back to vmalloc() than to kill things. For small + * allocations, just use GFP_KERNEL which will oom kill, thus no need + * for vmalloc fallback. */ - buf = kmalloc(size, GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN); + if (size > PAGE_SIZE) + gfp |= __GFP_NORETRY | __GFP_NOWARN; + buf = kmalloc(size, gfp); if (!buf && size > PAGE_SIZE) buf = vmalloc(size); return buf; @@ -48,18 +55,21 @@ static void *seq_buf_alloc(unsigned long size) * ERR_PTR(error). In the end of sequence they return %NULL. ->show() * returns 0 in case of success and negative number in case of error. * Returning SEQ_SKIP means "discard this element and move on". + * Note: seq_open() will allocate a struct seq_file and store its + * pointer in @file->private_data. This pointer should not be modified. */ int seq_open(struct file *file, const struct seq_operations *op) { - struct seq_file *p = file->private_data; + struct seq_file *p; + + WARN_ON(file->private_data); + + p = kzalloc(sizeof(*p), GFP_KERNEL); + if (!p) + return -ENOMEM; + + file->private_data = p; - if (!p) { - p = kmalloc(sizeof(*p), GFP_KERNEL); - if (!p) - return -ENOMEM; - file->private_data = p; - } - memset(p, 0, sizeof(*p)); mutex_init(&p->lock); p->op = op; #ifdef CONFIG_USER_NS @@ -368,36 +378,21 @@ EXPORT_SYMBOL(seq_release); * @esc: set of characters that need escaping * * Puts string into buffer, replacing each occurrence of character from - * @esc with usual octal escape. Returns 0 in case of success, -1 - in - * case of overflow. + * @esc with usual octal escape. + * Use seq_has_overflowed() to check for errors. */ -int seq_escape(struct seq_file *m, const char *s, const char *esc) +void seq_escape(struct seq_file *m, const char *s, const char *esc) { - char *end = m->buf + m->size; - char *p; - char c; + char *buf; + size_t size = seq_get_buf(m, &buf); + int ret; - for (p = m->buf + m->count; (c = *s) != '\0' && p < end; s++) { - if (!strchr(esc, c)) { - *p++ = c; - continue; - } - if (p + 3 < end) { - *p++ = '\\'; - *p++ = '0' + ((c & 0300) >> 6); - *p++ = '0' + ((c & 070) >> 3); - *p++ = '0' + (c & 07); - continue; - } - seq_set_overflow(m); - return -1; - } - m->count = p - m->buf; - return 0; + ret = string_escape_str(s, buf, size, ESCAPE_OCTAL, esc); + seq_commit(m, ret < size ? ret : -1); } EXPORT_SYMBOL(seq_escape); -int seq_vprintf(struct seq_file *m, const char *f, va_list args) +void seq_vprintf(struct seq_file *m, const char *f, va_list args) { int len; @@ -405,24 +400,20 @@ int seq_vprintf(struct seq_file *m, const char *f, va_list args) len = vsnprintf(m->buf + m->count, m->size - m->count, f, args); if (m->count + len < m->size) { m->count += len; - return 0; + return; } } seq_set_overflow(m); - return -1; } EXPORT_SYMBOL(seq_vprintf); -int seq_printf(struct seq_file *m, const char *f, ...) +void seq_printf(struct seq_file *m, const char *f, ...) { - int ret; va_list args; va_start(args, f); - ret = seq_vprintf(m, f, args); + seq_vprintf(m, f, args); va_end(args); - - return ret; } EXPORT_SYMBOL(seq_printf); @@ -487,6 +478,20 @@ int seq_path(struct seq_file *m, const struct path *path, const char *esc) } EXPORT_SYMBOL(seq_path); +/** + * seq_file_path - seq_file interface to print a pathname of a file + * @m: the seq_file handle + * @file: the struct file to print + * @esc: set of characters to escape in the output + * + * return the absolute path to the file. + */ +int seq_file_path(struct seq_file *m, struct file *file, const char *esc) +{ + return seq_path(m, &file->f_path, esc); +} +EXPORT_SYMBOL(seq_file_path); + /* * Same as seq_path, but relative to supplied root. */ @@ -538,6 +543,7 @@ int seq_dentry(struct seq_file *m, struct dentry *dentry, const char *esc) return res; } +EXPORT_SYMBOL(seq_dentry); static void *single_start(struct seq_file *p, loff_t *pos) { @@ -645,26 +651,25 @@ int seq_open_private(struct file *filp, const struct seq_operations *ops, } EXPORT_SYMBOL(seq_open_private); -int seq_putc(struct seq_file *m, char c) +void seq_putc(struct seq_file *m, char c) { - if (m->count < m->size) { - m->buf[m->count++] = c; - return 0; - } - return -1; + if (m->count >= m->size) + return; + + m->buf[m->count++] = c; } EXPORT_SYMBOL(seq_putc); -int seq_puts(struct seq_file *m, const char *s) +void seq_puts(struct seq_file *m, const char *s) { int len = strlen(s); - if (m->count + len < m->size) { - memcpy(m->buf + m->count, s, len); - m->count += len; - return 0; + + if (m->count + len >= m->size) { + seq_set_overflow(m); + return; } - seq_set_overflow(m); - return -1; + memcpy(m->buf + m->count, s, len); + m->count += len; } EXPORT_SYMBOL(seq_puts); @@ -675,8 +680,8 @@ EXPORT_SYMBOL(seq_puts); * This routine is very quick when you show lots of numbers. * In usual cases, it will be better to use seq_printf(). It's easier to read. */ -int seq_put_decimal_ull(struct seq_file *m, char delimiter, - unsigned long long num) +void seq_put_decimal_ull(struct seq_file *m, char delimiter, + unsigned long long num) { int len; @@ -688,35 +693,33 @@ int seq_put_decimal_ull(struct seq_file *m, char delimiter, if (num < 10) { m->buf[m->count++] = num + '0'; - return 0; + return; } len = num_to_str(m->buf + m->count, m->size - m->count, num); if (!len) goto overflow; m->count += len; - return 0; + return; + overflow: seq_set_overflow(m); - return -1; } EXPORT_SYMBOL(seq_put_decimal_ull); -int seq_put_decimal_ll(struct seq_file *m, char delimiter, - long long num) +void seq_put_decimal_ll(struct seq_file *m, char delimiter, long long num) { if (num < 0) { if (m->count + 3 >= m->size) { seq_set_overflow(m); - return -1; + return; } if (delimiter) m->buf[m->count++] = delimiter; num = -num; delimiter = '-'; } - return seq_put_decimal_ull(m, delimiter, num); - + seq_put_decimal_ull(m, delimiter, num); } EXPORT_SYMBOL(seq_put_decimal_ll); @@ -755,6 +758,46 @@ void seq_pad(struct seq_file *m, char c) } EXPORT_SYMBOL(seq_pad); +/* A complete analogue of print_hex_dump() */ +void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type, + int rowsize, int groupsize, const void *buf, size_t len, + bool ascii) +{ + const u8 *ptr = buf; + int i, linelen, remaining = len; + char *buffer; + size_t size; + int ret; + + if (rowsize != 16 && rowsize != 32) + rowsize = 16; + + for (i = 0; i < len && !seq_has_overflowed(m); i += rowsize) { + linelen = min(remaining, rowsize); + remaining -= rowsize; + + switch (prefix_type) { + case DUMP_PREFIX_ADDRESS: + seq_printf(m, "%s%p: ", prefix_str, ptr + i); + break; + case DUMP_PREFIX_OFFSET: + seq_printf(m, "%s%.8x: ", prefix_str, i); + break; + default: + seq_printf(m, "%s", prefix_str); + break; + } + + size = seq_get_buf(m, &buffer); + ret = hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize, + buffer, size, ascii); + seq_commit(m, ret < size ? ret : -1); + + seq_putc(m, '\n'); + } +} +EXPORT_SYMBOL(seq_hex_dump); + struct list_head *seq_list_start(struct list_head *head, loff_t pos) { struct list_head *lh; -- cgit 1.2.3-korg