[PATCH] ARM: 2837/2: Re: ARM: Make NWFPE preempt safe

Patch from Richard Purdie

NWFPE used global variables which meant it wasn't safe for use with
preemptive kernels. This patch removes them and communicates the
information between functions in a preempt safe manner. Generation
of some exceptions was broken and this has also been corrected.
Tests with glibc's maths test suite show no change in the results
before/after this patch.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 12 insertions, 12 deletions

diff --git a/arch/arm/nwfpe/extended_cpdo.c b/arch/arm/nwfpe/extended_cpdo.c
index c39f68a3449e..65a279ba927f 100644
--- a/arch/arm/nwfpe/extended_cpdo.c
+++ b/arch/arm/nwfpe/extended_cpdo.c
@@ -35,17 +35,17 @@ floatx80 floatx80_arccos(floatx80 rFm);
 floatx80 floatx80_pow(floatx80 rFn, floatx80 rFm);
 floatx80 floatx80_pol(floatx80 rFn, floatx80 rFm);
 
-static floatx80 floatx80_rsf(floatx80 rFn, floatx80 rFm)
+static floatx80 floatx80_rsf(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
 {
-	return floatx80_sub(rFm, rFn);
+	return floatx80_sub(roundData, rFm, rFn);
 }
 
-static floatx80 floatx80_rdv(floatx80 rFn, floatx80 rFm)
+static floatx80 floatx80_rdv(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
 {
-	return floatx80_div(rFm, rFn);
+	return floatx80_div(roundData, rFm, rFn);
 }
 
-static floatx80 (*const dyadic_extended[16])(floatx80 rFn, floatx80 rFm) = {
+static floatx80 (*const dyadic_extended[16])(struct roundingData*, floatx80 rFn, floatx80 rFm) = {
 	[ADF_CODE >> 20] = floatx80_add,
 	[MUF_CODE >> 20] = floatx80_mul,
 	[SUF_CODE >> 20] = floatx80_sub,
@@ -60,24 +60,24 @@ static floatx80 (*const dyadic_extended[16])(floatx80 rFn, floatx80 rFm) = {
 	[FRD_CODE >> 20] = floatx80_rdv,
 };
 
-static floatx80 floatx80_mvf(floatx80 rFm)
+static floatx80 floatx80_mvf(struct roundingData *roundData, floatx80 rFm)
 {
 	return rFm;
 }
 
-static floatx80 floatx80_mnf(floatx80 rFm)
+static floatx80 floatx80_mnf(struct roundingData *roundData, floatx80 rFm)
 {
 	rFm.high ^= 0x8000;
 	return rFm;
 }
 
-static floatx80 floatx80_abs(floatx80 rFm)
+static floatx80 floatx80_abs(struct roundingData *roundData, floatx80 rFm)
 {
 	rFm.high &= 0x7fff;
 	return rFm;
 }
 
-static floatx80 (*const monadic_extended[16])(floatx80 rFm) = {
+static floatx80 (*const monadic_extended[16])(struct roundingData*, floatx80 rFm) = {
 	[MVF_CODE >> 20] = floatx80_mvf,
 	[MNF_CODE >> 20] = floatx80_mnf,
 	[ABS_CODE >> 20] = floatx80_abs,
@@ -87,7 +87,7 @@ static floatx80 (*const monadic_extended[16])(floatx80 rFm) = {
 	[NRM_CODE >> 20] = floatx80_mvf,
 };
 
-unsigned int ExtendedCPDO(const unsigned int opcode, FPREG * rFd)
+unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
 {
 	FPA11 *fpa11 = GET_FPA11();
 	floatx80 rFm;
@@ -138,13 +138,13 @@ unsigned int ExtendedCPDO(const unsigned int opcode, FPREG * rFd)
 		}
 
 		if (dyadic_extended[opc_mask_shift]) {
-			rFd->fExtended = dyadic_extended[opc_mask_shift](rFn, rFm);
+			rFd->fExtended = dyadic_extended[opc_mask_shift](roundData, rFn, rFm);
 		} else {
 			return 0;
 		}
 	} else {
 		if (monadic_extended[opc_mask_shift]) {
-			rFd->fExtended = monadic_extended[opc_mask_shift](rFm);
+			rFd->fExtended = monadic_extended[opc_mask_shift](roundData, rFm);
 		} else {
 			return 0;
 		}