linux-kernel - patch "tools/firmware/ihex2fw: Simplify next record offset calculation" added to driver-core-next

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Date:   Fri, 25 Jan 2019 08:58:43 +0100
From:   <gregkh@...uxfoundation.org>
To:     andrew.smirnov@...il.com, akpm@...ux-foundation.org,
        cphealy@...il.com, dwmw2@...radead.org, gregkh@...uxfoundation.org,
        kyle@...nel.org, linux-kernel@...r.kernel.org,
        yamada.masahiro@...ionext.com
Subject: patch "tools/firmware/ihex2fw: Simplify next record offset calculation" added to driver-core-next


This is a note to let you know that I've just added the patch titled

    tools/firmware/ihex2fw: Simplify next record offset calculation

to my driver-core git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git
in the driver-core-next branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will also be merged in the next major kernel release
during the merge window.

If you have any questions about this process, please let me know.


>From 2ef8179bb7a6817de3fc9407ab55aa357f2d1e4d Mon Sep 17 00:00:00 2001
From: Andrey Smirnov <andrew.smirnov@...il.com>
Date: Thu, 20 Dec 2018 23:28:40 -0800
Subject: tools/firmware/ihex2fw: Simplify next record offset calculation

We can convert original expression for 'writelen" to use ALIGN as
follows:

    (p->len + 9) & ~3 => (p->len + 6 + 3) & ~3 => ALIGN(p->len + 6, 4)

Now, subsituting "p->len + 6" with "p->len + sizeof(p->addr) +
sizeof(p->len)" we end up with the same expression as used by kernel
couterpart in linux/ihex.h:

    ALIGN(p->len + sizeof(p->addr) + sizeof(p->len), 4)

That is a full size of the record, aligned to 4 bytes. No functional
change intended.

Cc: Chris Healy <cphealy@...il.com>
Cc: Kyle McMartin <kyle@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel <linux-kernel@...r.kernel.org>
Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/firmware/ihex2fw.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/firmware/ihex2fw.c b/tools/firmware/ihex2fw.c
index b58dd061e978..e081cef730d8 100644
--- a/tools/firmware/ihex2fw.c
+++ b/tools/firmware/ihex2fw.c
@@ -24,6 +24,10 @@
 #include <getopt.h>
 
 
+#define __ALIGN_KERNEL_MASK(x, mask)	(((x) + (mask)) & ~(mask))
+#define __ALIGN_KERNEL(x, a)		__ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
+#define ALIGN(x, a)			__ALIGN_KERNEL((x), (a))
+
 struct ihex_binrec {
 	struct ihex_binrec *next; /* not part of the real data structure */
         uint32_t addr;
@@ -259,13 +263,18 @@ static void file_record(struct ihex_binrec *record)
 	*p = record;
 }
 
+static uint16_t ihex_binrec_size(struct ihex_binrec *p)
+{
+	return p->len + sizeof(p->addr) + sizeof(p->len);
+}
+
 static int output_records(int outfd)
 {
 	unsigned char zeroes[6] = {0, 0, 0, 0, 0, 0};
 	struct ihex_binrec *p = records;
 
 	while (p) {
-		uint16_t writelen = (p->len + 9) & ~3;
+		uint16_t writelen = ALIGN(ihex_binrec_size(p), 4);
 
 		p->addr = htonl(p->addr);
 		p->len = htons(p->len);
-- 
2.20.1