linux-kernel - [PATCH v2 14/28] vsprintf: Refactor resource

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Date:   Thu, 19 May 2022 13:24:07 -0400
From:   Kent Overstreet <kent.overstreet@...il.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...r.kernel.org,
        pmladek@...e.com, rostedt@...dmis.org, senozhatsky@...omium.org
Cc:     Kent Overstreet <kent.overstreet@...il.com>,
        andriy.shevchenko@...ux.intel.com, willy@...radead.org
Subject: [PATCH v2 14/28] vsprintf: Refactor resource_string()

Two changes:
 - We're attempting to consolidate printf_spec and format string
   handling in the top level vpr_buf(), this changes resource_string to
   not take printf_spec

 - With the new printbuf helpers there's no need to use a separate stack
   allocated buffer, so this patch deletes it.

Signed-off-by: Kent Overstreet <kent.overstreet@...il.com>
---
 lib/vsprintf.c | 52 +++++++++++++++++++++++---------------------------
 1 file changed, 24 insertions(+), 28 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 6bbbb52bb0..dd4bbb28e7 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1037,7 +1037,7 @@ static const struct printf_spec default_dec_spec = {
 
 static noinline_for_stack
 void resource_string(struct printbuf *out, struct resource *res,
-		     struct printf_spec spec, const char *fmt)
+		     int decode)
 {
 #ifndef IO_RSRC_PRINTK_SIZE
 #define IO_RSRC_PRINTK_SIZE	6
@@ -1076,63 +1076,58 @@ void resource_string(struct printbuf *out, struct resource *res,
 #define FLAG_BUF_SIZE		(2 * sizeof(res->flags))
 #define DECODED_BUF_SIZE	sizeof("[mem - 64bit pref window disabled]")
 #define RAW_BUF_SIZE		sizeof("[mem - flags 0x]")
-	char sym_buf[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
-		     2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
-	struct printbuf sym = PRINTBUF_EXTERN(sym_buf, sizeof(sym_buf));
-	int decode = (fmt[0] == 'R') ? 1 : 0;
 	const struct printf_spec *specp;
 
-	if (check_pointer_spec(out, res, spec))
+	if (check_pointer(out, res))
 		return;
 
-	__pr_char(&sym, '[');
+	__pr_char(out, '[');
 	if (res->flags & IORESOURCE_IO) {
-		string_nocheck(&sym, "io  ", str_spec);
+		string_nocheck(out, "io  ", str_spec);
 		specp = &io_spec;
 	} else if (res->flags & IORESOURCE_MEM) {
-		string_nocheck(&sym, "mem ", str_spec);
+		string_nocheck(out, "mem ", str_spec);
 		specp = &mem_spec;
 	} else if (res->flags & IORESOURCE_IRQ) {
-		string_nocheck(&sym, "irq ", str_spec);
+		string_nocheck(out, "irq ", str_spec);
 		specp = &default_dec_spec;
 	} else if (res->flags & IORESOURCE_DMA) {
-		string_nocheck(&sym, "dma ", str_spec);
+		string_nocheck(out, "dma ", str_spec);
 		specp = &default_dec_spec;
 	} else if (res->flags & IORESOURCE_BUS) {
-		string_nocheck(&sym, "bus ", str_spec);
+		string_nocheck(out, "bus ", str_spec);
 		specp = &bus_spec;
 	} else {
-		string_nocheck(&sym, "??? ", str_spec);
+		string_nocheck(out, "??? ", str_spec);
 		specp = &mem_spec;
 		decode = 0;
 	}
 	if (decode && res->flags & IORESOURCE_UNSET) {
-		string_nocheck(&sym, "size ", str_spec);
-		number(&sym, resource_size(res), *specp);
+		string_nocheck(out, "size ", str_spec);
+		number(out, resource_size(res), *specp);
 	} else {
-		number(&sym, res->start, *specp);
+		number(out, res->start, *specp);
 		if (res->start != res->end) {
-			__pr_char(&sym, '-');
-			number(&sym, res->end, *specp);
+			__pr_char(out, '-');
+			number(out, res->end, *specp);
 		}
 	}
 	if (decode) {
 		if (res->flags & IORESOURCE_MEM_64)
-			string_nocheck(&sym, " 64bit", str_spec);
+			string_nocheck(out, " 64bit", str_spec);
 		if (res->flags & IORESOURCE_PREFETCH)
-			string_nocheck(&sym, " pref", str_spec);
+			string_nocheck(out, " pref", str_spec);
 		if (res->flags & IORESOURCE_WINDOW)
-			string_nocheck(&sym, " window", str_spec);
+			string_nocheck(out, " window", str_spec);
 		if (res->flags & IORESOURCE_DISABLED)
-			string_nocheck(&sym, " disabled", str_spec);
+			string_nocheck(out, " disabled", str_spec);
 	} else {
-		string_nocheck(&sym, " flags ", str_spec);
-		number(&sym, res->flags, default_flag_spec);
+		string_nocheck(out, " flags ", str_spec);
+		number(out, res->flags, default_flag_spec);
 	}
-	__pr_char(&sym, ']');
-	printbuf_nul_terminate(&sym);
+	__pr_char(out, ']');
 
-	string_nocheck(out, sym_buf, spec);
+	printbuf_nul_terminate(out);
 }
 
 static noinline_for_stack
@@ -2306,7 +2301,8 @@ void pointer(struct printbuf *out, const char *fmt,
 		return do_width_precision(out, prev_pos, spec);
 	case 'R':
 	case 'r':
-		return resource_string(out, ptr, spec, fmt);
+		resource_string(out, ptr, fmt[0] == 'R');
+		return do_width_precision(out, prev_pos, spec);
 	case 'h':
 		return hex_string(out, ptr, spec, fmt);
 	case 'b':
-- 
2.36.0