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received-spf: None (protection.outlook.com: wavecomp.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: cZJsMpqKDcoskgCEm7UjFFxY5yM6Ptm0L8wRvBXorC8NZzw157myQJ2TUP5L9NvdqWckxIEpV1pinBOP/lG12NGGIpThvr+VM2bEV9d6rru50YrbkAr1mckuy3AwwmIDjde3+iNY8GYlXU2Gk5p9KOiyMVgV/aBQY35EE2vKa/oC7kM38e3EbwkXC4ycmZStScW98Pvx4qrCCyQTjSBA/q4bai2TZqM0t8fFUdLPzYjr+Vdm71KGZAmAj4iq2tuZWbdiMvZsN+h7n4os7ZUkRE/RzRXORWx7GJZZoiXG3FwCRuhBL4YPahMPl3yas2Mk6utahn2kxg600/ASBV8tPpMibCilhOSkOlW4OD1YXJpDeLko4tZh2shk0DIFNyVYJ80YlmBX7OG24O5n+yp40ZYGAyecFK+4UZv0+dejzv4= Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: mips.com X-MS-Exchange-CrossTenant-Network-Message-Id: 4d790d6c-0013-42ec-7c79-08d745fb2047 X-MS-Exchange-CrossTenant-originalarrivaltime: 30 Sep 2019 23:08:37.8047 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 463607d3-1db3-40a0-8a29-970c56230104 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: D2h52Eny3Cin1RaHdj3yN4r148ulaWfmmuZkUHxqWVlqJQo1Y9gXAYnX7ceiSOm0rDfRrhPNXgPJwiNpOr/81w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR2201MB1022 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Generate the sync instructions required to workaround Loongson3 LL/SC errata within inline asm blocks, which feels a little safer than doing it from C where strictly speaking the compiler would be well within its rights to insert a memory access between the separate asm statements we previously had, containing sync & ll instructions respectively. Signed-off-by: Paul Burton --- arch/mips/include/asm/bitops.h | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-) diff --git a/arch/mips/include/asm/bitops.h b/arch/mips/include/asm/bitops.= h index 59fe1d5d4fc9..9e967d6622c8 100644 --- a/arch/mips/include/asm/bitops.h +++ b/arch/mips/include/asm/bitops.h @@ -31,6 +31,7 @@ asm volatile( \ " .set push \n" \ " .set " MIPS_ISA_LEVEL " \n" \ + " " __SYNC(full, loongson3_war) " \n" \ "1: " __LL "%0, %1 \n" \ " " insn " \n" \ " " __SC "%0, %1 \n" \ @@ -47,6 +48,7 @@ asm volatile( \ " .set push \n" \ " .set " MIPS_ISA_LEVEL " \n" \ + " " __SYNC(full, loongson3_war) " \n" \ "1: " __LL ll_dst ", %2 \n" \ " " insn " \n" \ " " __SC "%1, %2 \n" \ @@ -96,12 +98,10 @@ static inline void set_bit(unsigned long nr, volatile u= nsigned long *addr) } =20 if ((MIPS_ISA_REV >=3D 2) && __builtin_constant_p(bit) && (bit >=3D 16)) = { - loongson_llsc_mb(); __bit_op(*m, __INS "%0, %3, %2, 1", "i"(bit), "r"(~0)); return; } =20 - loongson_llsc_mb(); __bit_op(*m, "or\t%0, %2", "ir"(BIT(bit))); } =20 @@ -126,12 +126,10 @@ static inline void clear_bit(unsigned long nr, volati= le unsigned long *addr) } =20 if ((MIPS_ISA_REV >=3D 2) && __builtin_constant_p(bit)) { - loongson_llsc_mb(); __bit_op(*m, __INS "%0, $0, %2, 1", "i"(bit)); return; } =20 - loongson_llsc_mb(); __bit_op(*m, "and\t%0, %2", "ir"(~BIT(bit))); } =20 @@ -168,7 +166,6 @@ static inline void change_bit(unsigned long nr, volatil= e unsigned long *addr) return; } =20 - loongson_llsc_mb(); __bit_op(*m, "xor\t%0, %2", "ir"(BIT(bit))); } =20 @@ -190,7 +187,6 @@ static inline int test_and_set_bit_lock(unsigned long n= r, if (!kernel_uses_llsc) { res =3D __mips_test_and_set_bit_lock(nr, addr); } else { - loongson_llsc_mb(); orig =3D __test_bit_op(*m, "%0", "or\t%1, %0, %3", "ir"(BIT(bit))); @@ -237,13 +233,11 @@ static inline int test_and_clear_bit(unsigned long nr= , if (!kernel_uses_llsc) { res =3D __mips_test_and_clear_bit(nr, addr); } else if ((MIPS_ISA_REV >=3D 2) && __builtin_constant_p(nr)) { - loongson_llsc_mb(); res =3D __test_bit_op(*m, "%1", __EXT "%0, %1, %3, 1;" __INS "%1, $0, %3, 1", "i"(bit)); } else { - loongson_llsc_mb(); orig =3D __test_bit_op(*m, "%0", "or\t%1, %0, %3;" "xor\t%1, %1, %3", @@ -276,7 +270,6 @@ static inline int test_and_change_bit(unsigned long nr, if (!kernel_uses_llsc) { res =3D __mips_test_and_change_bit(nr, addr); } else { - loongson_llsc_mb(); orig =3D __test_bit_op(*m, "%0", "xor\t%1, %0, %3", "ir"(BIT(bit))); --=20 2.23.0