This is a note to let you know that I've just added the patch titled
MIPS: math-emu: <MAXA|MINA>.<D|S>: Fix cases of input values with opposite signs
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mips-math-emu-maxa-mina-.-d-s-fix-cases-of-input-values-with-opposite-signs.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1a41b3b441508ae63b1a9ec699ec94065739eb60 Mon Sep 17 00:00:00 2001
From: Aleksandar Markovic <aleksandar.markovic@xxxxxxxxxx>
Date: Thu, 27 Jul 2017 18:08:51 +0200
Subject: MIPS: math-emu: <MAXA|MINA>.<D|S>: Fix cases of input values with opposite signs
From: Aleksandar Markovic <aleksandar.markovic@xxxxxxxxxx>
commit 1a41b3b441508ae63b1a9ec699ec94065739eb60 upstream.
Fix the value returned by <MAXA|MINA>.<D|S>, if the inputs are normal
fp numbers of the same absolute value, but opposite signs.
A relevant example:
MAXA.S fd,fs,ft:
If fs contains -3.0, and ft contains +3.0, fd is going to contain
+3.0 (without this patch, it used to contain -3.0).
Fixes: a79f5f9ba508 ("MIPS: math-emu: Add support for the MIPS R6 MAX{, A} FPU instruction")
Fixes: 4e9561b20e2f ("MIPS: math-emu: Add support for the MIPS R6 MIN{, A} FPU instruction")
Signed-off-by: Miodrag Dinic <miodrag.dinic@xxxxxxxxxx>
Signed-off-by: Goran Ferenc <goran.ferenc@xxxxxxxxxx>
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@xxxxxxxxxx>
Reviewed-by: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Bo Hu <bohu@xxxxxxxxxx>
Cc: Douglas Leung <douglas.leung@xxxxxxxxxx>
Cc: Jin Qian <jinqian@xxxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: Petar Jovanovic <petar.jovanovic@xxxxxxxxxx>
Cc: Raghu Gandham <raghu.gandham@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/16883/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/math-emu/dp_fmax.c | 8 ++++++--
arch/mips/math-emu/dp_fmin.c | 6 +++++-
arch/mips/math-emu/sp_fmax.c | 8 ++++++--
arch/mips/math-emu/sp_fmin.c | 6 +++++-
4 files changed, 22 insertions(+), 6 deletions(-)
--- a/arch/mips/math-emu/dp_fmax.c
+++ b/arch/mips/math-emu/dp_fmax.c
@@ -243,7 +243,11 @@ union ieee754dp ieee754dp_fmaxa(union ie
return y;
/* Compare mantissa */
- if (xm <= ym)
+ if (xm < ym)
return y;
- return x;
+ else if (xm > ym)
+ return x;
+ else if (xs == 0)
+ return x;
+ return y;
}
--- a/arch/mips/math-emu/dp_fmin.c
+++ b/arch/mips/math-emu/dp_fmin.c
@@ -243,7 +243,11 @@ union ieee754dp ieee754dp_fmina(union ie
return x;
/* Compare mantissa */
- if (xm <= ym)
+ if (xm < ym)
+ return x;
+ else if (xm > ym)
+ return y;
+ else if (xs == 1)
return x;
return y;
}
--- a/arch/mips/math-emu/sp_fmax.c
+++ b/arch/mips/math-emu/sp_fmax.c
@@ -243,7 +243,11 @@ union ieee754sp ieee754sp_fmaxa(union ie
return y;
/* Compare mantissa */
- if (xm <= ym)
+ if (xm < ym)
return y;
- return x;
+ else if (xm > ym)
+ return x;
+ else if (xs == 0)
+ return x;
+ return y;
}
--- a/arch/mips/math-emu/sp_fmin.c
+++ b/arch/mips/math-emu/sp_fmin.c
@@ -243,7 +243,11 @@ union ieee754sp ieee754sp_fmina(union ie
return x;
/* Compare mantissa */
- if (xm <= ym)
+ if (xm < ym)
+ return x;
+ else if (xm > ym)
+ return y;
+ else if (xs == 1)
return x;
return y;
}
Patches currently in stable-queue which might be from aleksandar.markovic@xxxxxxxxxx are
queue-4.9/mips-math-emu-maddf-msubf-.-d-s-fix-nan-propagation.patch
queue-4.9/mips-math-emu-max-maxa-min-mina-.-d-s-fix-cases-of-both-inputs-zero.patch
queue-4.9/mips-math-emu-handle-zero-accumulator-case-in-maddf-and-msubf-separately.patch
queue-4.9/mips-math-emu-max-min-.-d-s-fix-cases-of-both-inputs-negative.patch
queue-4.9/mips-math-emu-max-maxa-min-mina-.-d-s-fix-quiet-nan-propagation.patch
queue-4.9/mips-math-emu-maddf-msubf-.d-fix-accuracy-64-bit-case.patch
queue-4.9/mips-math-emu-maddf-msubf-.s-fix-accuracy-32-bit-case.patch
queue-4.9/mips-math-emu-maxa-mina-.-d-s-fix-cases-of-input-values-with-opposite-signs.patch
queue-4.9/mips-math-emu-maxa-mina-.-d-s-fix-cases-of-both-infinite-inputs.patch
queue-4.9/mips-math-emu-mina.-d-s-fix-some-cases-of-infinity-and-zero-inputs.patch
queue-4.9/mips-math-emu-maddf-msubf-.-d-s-fix-some-cases-of-zero-inputs.patch
queue-4.9/mips-math-emu-maddf-msubf-.-d-s-clean-up-maddf_flags-enumeration.patch
queue-4.9/mips-math-emu-maddf-msubf-.-d-s-fix-some-cases-of-infinite-inputs.patch