Add shared memory support for PCMPI using both shmget() and MPI_Win_allocate_shared()

Remove outdated comment from pcmpi.c

Commit-type: housekeeping

Add logging for distribution times needed for PCMPI

Patch: implement PCPatchGetSubKSP

Merge remote-tracking branch 'origin/release'

PCFIELDSPLIT: reuse computation of Schur complement in PCApply()

Merge branch 'jolivet/fix-docs' into 'release'

Docs fixes

See merge request petsc/petsc!7682

PCFIELDSPLIT: reassemble explicit Schur complement with PC_FIELDSPLIT_SCHUR_PRE_FULL

Docs: fix nonexisting functions and variables

The use case of PetscOptionsGetViewer() has evolved to no longer be the get/restore model

Hence the code needs to be refactored

Introduce PetscCallNull() and PetscCallMPINull() to simplify PETSC_VI

The use case of PetscOptionsGetViewer() has evolved to no longer be the get/restore model

Hence the code needs to be refactored

Introduce PetscCallNull() and PetscCallMPINull() to simplify PETSC_VIEWER_XXXX_() routines

Reported-by: James Wright
Thanks-to: Jeremy L Thompson

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Merge remote-tracking branch 'origin/release'

Refactor VecSetInf() into VecFlag() and deprecate VecSetInf()

Reported-by: Stefano Zampini

Update file gamg.c

bjkokkos: cleanup diagnostics

This requires some changes to user FORTRAN code

Pass PETSC_NULL_XXX_ARRAY when passing a NULL as an argument that is expecting an array
Pass PETSC_NULL_ENUM when argument returns an enum instead of

This requires some changes to user FORTRAN code

Pass PETSC_NULL_XXX_ARRAY when passing a NULL as an argument that is expecting an array
Pass PETSC_NULL_ENUM when argument returns an enum instead of PETSC_NULL_INTEGER
Pass arrays (and not scalar values) when the argument is expecting an array; this means replace, for example, the argument v with [v]
Use PetscObjectIsNull(obj) to check if the object is NULL, instead of obj == PETSC_NULL_XXX

The compiler will now automatically prevent you from using the wrong argument type for the first three bullets above
This will also require an update sowing with the new sowing branch this MR is using.

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Merge remote-tracking branch 'origin/release'

Minor docs fixes

PCHPDDM: expand dual-space overlap to always include local unknowns

PCHPDDM: fix saddle-point solver with -pc_hpddm_harmonic_overlap > 1

PCHPDDM: build an auxiliary Mat when A11 is diagonal

PCHPDDM: fix non-destroyed Vec and use of destroyed Mat

PCHPDDM: switch from VecScatter to PetscSF

Merge remote-tracking branch 'origin/release'

Demonstrate approximate Benzi preconditioner for grad-div perturbations to the velocity block of Navier-Stokes

Merge branch 'knepley/fix-pc-composite-cl' into 'release'

PC: Allow many more composite PCs from the command line

See merge request petsc/petsc!7601